Choosing between complaint and complain often creates confusion for English learners. Both words share the same word family, but their grammar and correct usage differ. Understanding this key difference makes your English language clearer and more accurate. In simple terms, complaint is a noun, while complain is a verb.
This guide explains complaint vs complain through meaning, differences, and practical examples. You will learn when to make a complaint, complain about an issue, or describe dissatisfaction. We will also cover formal writing, everyday English usage, and common grammatical errors. By learning the right word choice, you can improve writing accuracy and professional communication.
Quick Answer
Complaint is a noun. Complain is a verb.
Use complaint when you are naming the problem, grievance, statement, or formal report.
“I have a complaint about the service.”
Use complain when you are describing the action of expressing dissatisfaction.
“I want to complain about the service.”
The most common mistake is “make a complain.” That form is incorrect in standard English.
The correct expression is:
“make a complaint”
You can also simply use the verb:
“I want to complain.”
The distinction becomes even clearer when you look at related forms:
| Word | Part of speech | Example |
| complaint | Noun | “She filed a complaint.” |
| complain | Verb | “She complained about the delay.” |
| complained | Past tense/past participle | “She complained yesterday.” |
| complaining | -ing form/noun in some contexts | “There was constant complaining.” |
Cambridge Dictionary defines complaint as a noun for a statement that something is wrong or unsatisfactory. It defines complain as a verb meaning to say that something is wrong or unsatisfactory.
Comparison Overview
The fastest way to understand complaint vs. complain is to compare how each word behaves inside a sentence.
| Feature | Complaint | Complain |
| Word type | Noun | Verb |
| Main meaning | A statement or expression of dissatisfaction | The act of expressing dissatisfaction |
| Common pattern | make a complaint | complain about something |
| Another common pattern | file a complaint | complain to someone |
| Example | “I made a complaint.” | “I complained to the manager.” |
| Plural/past form | complaints | complained |
| -ing form | complaining can act as a noun | complaining is the verb’s -ing form |
| Formal use | “file a formal complaint” | “complain to the authority” |
A useful mental shortcut is to think of complaint as the thing and complain as the action.
Imagine a customer has received the wrong product.
The customer’s complaint is the statement that the product was wrong. The customer complains when they tell the company about the problem.
That simple distinction solves most cases.
Main Differences Between Complaint and Complain
The biggest difference between complaint and complain comes down to grammatical function.
Complaint Is a Noun
A noun names a person, place, thing, idea, event, or concept. Complaint names an expression of dissatisfaction or a formal grievance.
Consider these examples:
- “The company received a complaint.”
- “I have a complaint about my order.”
- “Her complaint concerned the billing error.”
- “The manager handled the complaint.”
- “Several complaints were filed.”
Notice what happens around complaint. You can put words such as a, the, my, her, this, or several before it.
You can also make it plural:
complaint → complaints
This is a strong grammatical clue.
You wouldn’t normally say:
“I have a complain.”
You would say:
“I have a complaint.”
The noun carries the name of the grievance.
Complain Is a Verb
A verb describes an action, state, or occurrence. Complain describes the act of expressing dissatisfaction.
For example:
- “I want to complain.”
- “She complained about the food.”
- “They complained to the manager.”
- “We complained that the room was too cold.”
- “Customers have complained about the delays.”
The verb can change tense:
- complain
- complains
- complained
- complaining
That flexibility is another clue that you’re dealing with a verb.
Cambridge’s grammar guidance specifically identifies complain as a verb and notes that it normally takes about when you identify the thing causing dissatisfaction.
What Does “Complaint” Mean?
Complaint usually means a statement that something isn’t satisfactory.
It can describe something informal:
“My only complaint is that the room is too small.”
It can also describe a formal process:
“The customer filed a complaint with the company.”
The word appears frequently in professional and administrative language because it can refer to a specific grievance that someone records, investigates, or resolves.
Common combinations include:
- make a complaint
- file a complaint
- receive a complaint
- handle a complaint
- deal with a complaint
- investigate a complaint
- resolve a complaint
- withdraw a complaint
- a complaint about something
- a complaint against someone
For example:
“The hotel received a complaint about excessive noise.”
Here, complaint names the report made by the guest.
Complaint Can Have More Than One Meaning
The word has another established meaning that sometimes surprises learners.
Complaint can also refer to an illness or physical condition, especially in expressions such as:
“a stomach complaint”
“a heart complaint”
This medical sense is established dictionary usage. It isn’t simply an informal variation of the ordinary meaning.
In legal contexts, complaint can have an even more specific meaning. It may refer to a formal statement alleging wrongdoing or asserting a legal claim.
That means context matters.
Compare:
“The customer made a complaint about the service.”
with:
“The plaintiff filed a complaint.”
The first sentence concerns dissatisfaction with service. The second uses a formal legal sense.
What Does “Complain” Mean?
Complain means to express dissatisfaction or to tell someone that something is wrong.
It usually functions as an intransitive verb. In ordinary usage, you don’t normally place the thing you’re unhappy about directly after complain.
For example:
“She complained about the noise.”
Not:
“She complained the noise.”
The preposition about connects the verb to the thing causing dissatisfaction.
Cambridge specifically recommends complain about something rather than using complain directly with the object.
Common Patterns With Complain
Several sentence structures occur regularly.
Complain about + noun
“They complained about the price.”
Complain to + person or organization
“She complained to the manager.”
Complain to + person + about + issue
“He complained to the manager about the delay.”
Complain that + clause
“The employees complained that the office was too cold.”
Complain of + condition
“The patient complained of severe pain.”
These patterns aren’t interchangeable in every context. Each one highlights a slightly different relationship.
“Complain About” Is Especially Common
When you identify the problem itself, complain about is the standard pattern.
Examples include:
- complain about noise
- complain about prices
- complain about service
- complain about delays
- complain about working conditions
- complain about a product
- complain about a decision
Cambridge provides the same basic construction in examples involving noise and service quality.
“Make a Complaint” vs. “Make a Complain”
This is probably the most important mistake to avoid.
Correct: “Make a Complaint”
“I want to make a complaint.”
Here, complaint acts as a noun. The verb make takes a noun phrase.
The same structure appears in:
- make a complaint
- make a request
- make a suggestion
- make an accusation
- make an observation
Incorrect: “Make a Complain”
“I want to make a complain.”
This doesn’t work in standard English because complain is a verb. The expression make a complain incorrectly tries to use that verb as a noun.
Instead, choose one of these:
“I want to make a complaint.”
or:
“I want to complain.”
Both are grammatical. The second is usually more direct.
Why the Mistake Happens
The confusion makes sense. Many English word families contain closely related noun and verb forms.
For example:
- advise → advice
- decide → decision
- complain → complaint
The spelling doesn’t always follow a predictable pattern. That’s why memorizing the grammatical role of each word works better than trying to guess from appearance.
Complaint About vs. Complain About
These expressions look nearly identical. Their grammatical jobs differ.
Complaint About
Complaint about + noun means a complaint concerning a particular issue.
“We received a complaint about the noise.”
“She submitted a complaint about the billing error.”
“His complaint about the food was reasonable.”
Here, complaint is the noun.
Complain About
Complain about + noun means to express dissatisfaction concerning something.
“The guests complained about the noise.”
“She complained about the billing error.”
“His customers often complain about the food.”
Here, complain is the verb.
The easiest comparison looks like this:
| Noun structure | Verb structure |
| “a complaint about the noise” | “complain about the noise” |
| “her complaint about the price” | “she complained about the price” |
| “a complaint about the service” | “customers complain about the service” |
The topic stays the same. The grammar changes.
Read More: Perfect vs Prefect: Meaning, Differences, Spelling, Pronunciation, and Correct Usage
Complaint Against vs. Complain To
Another useful distinction appears in formal situations.
Complaint against identifies the person, company, organization, or entity that the complaint concerns.
“The employee filed a complaint against the company.”
Complain to identifies the person or organization that receives the complaint.
“The employee complained to the manager.”
You can combine both ideas:
“The employee complained to the manager about the company.”
The three elements are now clear:
- employee = person making the complaint
- manager = person receiving it
- company = subject of the complaint
Formal English often requires this level of precision. Cambridge’s business dictionary examples include both complaint about and complaint against in formal contexts.
Common Mistakes With Complaint and Complain
A few errors appear repeatedly.
| Incorrect | Correct | Explanation |
| “I want to make a complain.” | “I want to make a complaint.” | Use the noun after make a. |
| “I want to complaint about it.” | “I want to complain about it.” | The sentence needs a verb. |
| “She complained the service.” | “She complained about the service.” | Use about for the issue. |
| “He made a complain yesterday.” | “He made a complaint yesterday.” | Complaint is the noun. |
| “They complaint about the price.” | “They complained about the price.” | The past-tense verb is complained. |
| “I have a complain.” | “I have a complaint.” | The article a can introduce the noun. |
| “She filed a complain.” | “She filed a complaint.” | File a complaint is the correct noun phrase. |
These aren’t merely spelling mistakes. Most involve part of speech.
Once you identify whether the sentence needs a noun or a verb, the correct choice becomes much easier.
Complaint and Complain in Everyday English
The words appear in many ordinary situations.
Customer Service
Suppose an online order arrives damaged.
You might say:
“I have a complaint about my order.”
If you’re describing your action:
“I want to complain about my order.”
If you’re describing what happened yesterday:
“I complained to customer service yesterday.”
If you’re describing the formal record:
“The company received a complaint about the damaged package.”
The situation stays constant. The grammatical perspective changes.
Workplace Communication
Workplace writing often needs a measured tone.
Informal:
“Several employees complained about the schedule.”
More formal:
“Several employees submitted complaints about the revised schedule.”
The second version sounds more administrative because complaints turns the issue into a documented noun.
Travel
Imagine a flight arrives several hours late.
You might say:
“Passengers complained about the delay.”
A formal report could say:
“The airline received numerous complaints about the delay.”
Again, complain describes what passengers did. Complaints identifies the reports the airline received.
Everyday Conversation
In casual speech, complain is extremely flexible.
“I’m not trying to complain.”
“He always complains about the weather.”
“She complained that the restaurant was too crowded.”
“Nobody complained about the music.”
The noun works differently:
“My only complaint is the waiting time.”
“That’s a fair complaint.”
“I have one small complaint.”
This difference becomes almost automatic with practice.
Formal Complaint vs. Everyday Complaint
Not every complaint requires a formal process.
You can casually say:
“My only complaint is that the coffee is cold.”
That sentence expresses dissatisfaction without suggesting any official action.
A formal situation might involve:
“I would like to file a formal complaint regarding the service I received.”
The noun complaint works especially well in official language because it can represent a documented grievance.
Common formal expressions include:
- file a formal complaint
- submit a complaint
- make a complaint
- lodge a complaint
- register a complaint
- respond to a complaint
- investigate a complaint
- resolve a complaint
The precise expression depends on the institution and context. File a complaint is especially common in American English.
Complaint or Complain in American English
There isn’t a special American spelling that replaces one word with the other.
American English uses both complaint and complain.
The grammatical distinction remains the same:
“I filed a complaint.”
“I complained to the manager.”
The confusion sometimes comes from assuming that words with similar meanings must belong to different regional varieties. That isn’t the case here.
Cambridge’s American English entries identify complaint as a noun and complain as a verb. Their core meanings remain consistent across American and British English.
Complaint, Complained, and Complaining
Once complaint and complain make sense, their related forms become easier.
Complained
Complained is the simple past and past participle of complain.
“She complained about the noise.”
“They complained several times.”
“Customers have complained about the change.”
Cambridge identifies complained as both the past simple and past participle form of complain.
Complaining
Complaining is the -ing form of complain.
“He is complaining about the temperature.”
It can also function as a noun in certain contexts:
“There was too much complaining.”
In that construction, complaining refers to the act or behavior of expressing dissatisfaction.
Cambridge lists complaining as a noun meaning the act of saying that something is wrong or unsatisfactory.
Complaint Is Not Simply a Shorter Form of Complaining
This distinction matters.
Compare:
“Her complaint was justified.”
with:
“Her complaining was annoying.”
The first sentence focuses on a specific grievance or statement. The second focuses on the act or behavior of complaining.
The words overlap in meaning. Their grammatical functions aren’t identical.
The Origin of Complaint and Complain
The connection between these words goes back centuries.
Complain entered Middle English in the late fourteenth century. Historical sources trace it through Old French complaindre to a Latin root associated with lamenting and expressions of grief. Complaint developed from the related Old French noun complainte.
Their meanings have changed over time.
Earlier uses could involve:
- lamenting
- grieving
- expressing pain
- expressing sorrow
- making an accusation
- finding fault
Over the centuries, the modern sense of dissatisfaction became firmly established.
The historical connection explains why complaint and complain remain so closely related today. One developed as a noun while the other functions as a verb.
A Simple Test for Choosing Complaint or Complain
When you’re unsure, ask one question:
Does the sentence need a thing or an action?
If it needs the thing, use complaint.
“I have a complaint.”
If it needs the action, use complain.
“I want to complain.”
You can also examine the word immediately before the blank.
Words That Often Point Toward “Complaint”
- a
- the
- my
- your
- her
- his
- their
- several
- many
- formal
- written
Examples:
“I submitted a ___.”
Answer: complaint
“She has a ___.”
Answer: complaint
Structures That Often Point Toward “Complain”
- want to
- need to
- will
- may
- might
- did
- have
- has
- are
- was
Examples:
“I want to ___.”
Answer: complain
“They have ___ about the service.”
Answer: complained
Grammar provides the clue.
Real-World Case Study: Choosing the Right Word
Imagine a customer receives a damaged laptop.
The customer wants to contact the retailer.
Here are four possible sentences:
Sentence A
“I want to complain about the damaged laptop.”
Correct. Complain is the verb describing the customer’s action.
Sentence B
“I want to make a complaint about the damaged laptop.”
Correct. Complaint is the noun used after make a.
Sentence C
“I want to make a complain about the damaged laptop.”
Incorrect. Complain cannot function as the noun in this construction.
Sentence D
“I want to complaint about the damaged laptop.”
Incorrect. The sentence needs the verb complain.
The useful lesson is straightforward: don’t choose between the words based only on their spelling. Look at the grammar around them.
Case Study: Formal Customer-Service Language
Consider a customer who receives poor service.
A conversational message might say:
“I want to complain about the service I received today.”
A more formal version could say:
“I would like to make a formal complaint about the service I received today.”
Neither sentence is inherently better. They serve different communicative purposes.
The first emphasizes the action. The second emphasizes the formal grievance.
That distinction can help you choose language that matches the situation instead of simply reaching for the longest or most formal phrase.
Case Study: Workplace Writing
Consider an employee who believes a scheduling decision creates a problem.
Informal:
“Several employees complained about the new schedule.”
Formal:
“Management received several complaints about the new schedule.”
The first sentence focuses on employee behavior. The second focuses on the documented issues received by management.
This is a useful pattern beyond complaint and complain. English frequently changes emphasis by shifting between a verb and its related noun.
Quick Reference: Common Expressions
Expressions With Complaint
- make a complaint
- file a complaint
- submit a complaint
- receive a complaint
- handle a complaint
- investigate a complaint
- resolve a complaint
- withdraw a complaint
- a complaint about something
- a complaint against someone
- a formal complaint
- a written complaint
- a customer complaint
Expressions With Complain
- complain about something
- complain to someone
- complain to someone about something
- complain that something happened
- complain of pain
- complain repeatedly
- complain loudly
- complain bitterly
- complain formally
Learning these combinations can be more useful than memorizing isolated definitions. English relies heavily on recurring word patterns.
Complaint vs. Complain: Side-by-Side Examples
| Situation | Using complaint | Using complain |
| Poor service | “I have a complaint about the service.” | “I want to complain about the service.” |
| A delay | “We received a complaint about the delay.” | “Passengers complained about the delay.” |
| Workplace issue | “She filed a complaint.” | “She complained to HR.” |
| Noisy neighbors | “The landlord received a complaint.” | “Several tenants complained about the noise.” |
| Bad product | “He made a complaint about the product.” | “He complained about the product.” |
| Formal issue | “They submitted a formal complaint.” | “They formally complained to the agency.” |
The nouns and verbs describe related situations. They don’t perform the same grammatical job.
Frequently Asked Questions
What is the main difference between complaint and complain?
Complaint is a noun that names a statement of dissatisfaction, while complain is a verb that describes the action of expressing dissatisfaction.
Should I say complaint or complain in a sentence?
Choose complaint for the thing or grievance being reported. Use complain when describing the action, especially in everyday communication.
How do I use complain about correctly?
Use complain about when someone expresses dissatisfaction about a problem, poor service, or another issue. For example, you can complain about slow service.
Is complaint used in formal writing?
Yes. Complaint commonly appears in formal writing, workplace emails, formal letters, and other official contexts where clear communication matters.
How can I remember the correct word choice?
Remember this simple grammar rule: complaint names the problem or grievance, while complain names the action. This helps prevent common grammatical errors and improves writing accuracy.
Final Takeaway
Knowing the complaint vs complain key difference makes correct word choice much easier. Remember, complaint is a noun, while complain is a verb used to express dissatisfaction. With practice, you can avoid common grammar errors and improve clear writing in both formal writing and everyday English usage.
