Complaint is a noun, while complain is a verb. Both words are correct, but they are not interchangeable: use complaint for the report or concern itself, and complain for the act of expressing dissatisfaction. This distinction applies in both US and UK English.
One names a problem or expression of dissatisfaction, while the other describes the act of expressing it.
For example, you might tell a company about a poor experience by making a complaint. You might also complain to a manager about the same problem. Both words are correct, but they do not fit the same sentence.
Understanding this small difference can help you write clearer emails, speak more naturally, and avoid common English grammar mistakes.
Quick Answer
Complaint is a noun, while complain is a verb.
- Complaint: An expression of dissatisfaction about a problem, service, or situation.
- Complain: To express dissatisfaction about something.
Examples:
- I submitted a complaint about the delayed delivery.
- I decided to complain about the delayed delivery.
Remember this simple rule: You make or file a complaint, but you complain about a problem.
What Does Complaint Mean?
A complaint is a statement or report that expresses dissatisfaction with a person, service, product, decision, or situation. It can be spoken or written.
People may submit complaints when an order arrives late, a workplace rule seems unfair, or a neighbor makes excessive noise.
Examples:
- The customer filed a complaint about the damaged product.
- Her complaint concerned the manager’s behavior.
- We received several complaints about the noisy construction work.
- The patient described a complaint of persistent back pain.
The meaning of complaint depends on the situation. A customer may report poor service, while a legal complaint sets out claims in a court case. In healthcare, the term often refers to a symptom or concern shared by a patient, such as a headache or back pain.
The exact meaning depends on the situation, but complaint always functions as a noun.
What Does Complain Mean?
Complain is a verb that means to express dissatisfaction, annoyance, or concern about something. A person can complain in a conversation, send an email, or raise an issue with someone responsible for resolving it.
Examples:
- Employees complain about the lack of clear instructions.
- She complained to the hotel manager about the room.
- Several residents complain that the traffic is too loud.
- The patient complained of severe stomach pain.
The verb changes according to tense and sentence structure:
| Verb form | Example |
|---|---|
| Complain | I complain when the service is poor. |
| Complains | He complains about the temperature. |
| Complained | They complained yesterday. |
| Complaining | She is complaining about the delay. |
Complaining can also describe a person’s behavior, as in “His constant complaining annoyed the team.”
Difference Between Complaint and Complain
The main difference is their part of speech. Complaint names the issue; complain describes the action of expressing dissatisfaction.
| Feature | Complaint | Complain |
|---|---|---|
| Part of speech | Noun | Verb |
| Meaning | An expression of dissatisfaction | To express dissatisfaction |
| Common pattern | Make a complaint | Complain about something |
| Another pattern | File a complaint | Complain to someone |
| Example | Her complaint was serious. | She complained to her supervisor. |
Compare these sentences:
- Noun: The customer made a complaint about the bill.
- Verb: The customer complained about the bill.
Both sentences communicate dissatisfaction. The first focuses on the report or concern, while the second focuses on the customer’s action.
Complaint and Complain in a Sentence
Seeing both words in everyday contexts makes the distinction easier to remember.
Examples of Complaint in Sentences
- I sent a complaint to the airline about my canceled flight.
- The school received a complaint from a parent.
- His main complaint was the high cost of parking.
- The company investigated the customer’s complaint.
- She has a complaint about the way the meeting was handled.
Examples with Complain
- I want to complain about the poor internet connection.
- The passengers complained about the long wait.
- Please complain to the supervisor if the problem continues.
- My neighbors complain whenever the music is too loud.
- He complained that the instructions were unclear.
Using Both Words
- Complaint: Maya wrote a complaint to the store. Complain: Maya decided to complain about the damaged item.
- Complaint: The manager reviewed the complaint. Complain: The employee complained about the unfair schedule.
- Complaint: We received a complaint about the noise. Complain: Residents complained about the noise last night.
These examples show that the noun and verb can describe the same situation without being interchangeable. Three more natural examples are: She filed a complaint after the refund was delayed. He did not want to complain in public. Their complaint led to a full investigation.
Is It “I Have a Complaint” or “I Have a Complain”?
The correct expression is “I have a complaint.”
The article a normally introduces a singular countable noun. Since complaint is a noun, it fits this sentence. Complain is a verb, so it cannot replace the noun here.
Correct:
- I have a complaint about my order.
- I have a complaint regarding the service.
- I would like to make a complaint.
Incorrect:
- I have a complain about my order.
- I would like to make a complain.
You can also say, “I want to complain about my order.” In that sentence, complain is correct because it follows the verb phrase “want to.”
Is It “File a Complaint” or “File a Complain”?
The correct phrase is “file a complaint.” The word file in this expression means to submit or officially record a report.
Examples:
- The customer filed a complaint against the company.
- You can file a complaint about a billing error.
- She plans to file a formal complaint with the department.
“File a complain” is incorrect because file a requires a noun in this expression.
Other common phrases include:
- Make a complaint: I would like to make a complaint about the service.
- Submit a complaint: He submitted a complaint through the website.
- Lodge a complaint: She lodged a complaint with the relevant office.
- Register a complaint: The receptionist registered the patient’s complaint.
- Complain about: They complained about the unexpected charge.
- Complain to: I complained to the customer service representative.
The first four expressions take the noun complaint. The last two use the verb complain.
Complaint or Complain in Customer Service
Customer service is one of the most common settings in which these words appear. A written report about a defective product is a complaint, while speaking to an agent about the defect is an act of complaining.
Examples:
- Complaint: The company received a complaint about a missing package.
- Complain: The buyer called to complain about the missing package.
- Complaint: Your complaint has been forwarded to the billing team.
- Complain: Customers often complain when refunds take too long.
For a formal email, the noun may sound more direct and professional:
“I am writing to make a complaint about the incorrect charge on my account.”
For a conversation, the verb is natural:
“I’d like to complain about an incorrect charge on my account.”
Both forms are suitable; the sentence structure determines which one belongs.
Patient Complaint or Patient Complain?
In medical English, patient complaint is a valid phrase. It often refers to a symptom or concern reported by a patient. Patient complain can also be grammatically correct, but it requires a sentence structure in which complain acts as a verb.
Examples:
- Patient complaint: The patient’s main complaint was a persistent headache.
- Patient complains: The patient complains of pain in the lower back.
- Patient complained: The patient complained of dizziness after standing.
- Chief complaint: The chief complaint was chest discomfort.
A chief complaint is the main symptom or concern that brings a patient to a healthcare professional. It is a standard medical term, not a special spelling of complain.
Notice the difference:
- The patient’s complaint was recorded in the medical notes.
- The patient complained of discomfort during the examination.
In the first sentence, the word names the concern. In the second, it describes what the patient reported.
Common Mistakes with Complaint and Complain
These errors often happen when learners confuse a noun with a verb.
| Incorrect | Correct |
|---|---|
| I have a complain. | I have a complaint. |
| Please file a complain. | Please file a complaint. |
| He complaint about the food. | He complained about the food. |
| She made a complain. | She made a complaint. |
| They complaint every day. | They complain every day. |
One useful way to check a sentence is to look at the words around the target word.
- After a, phrases such as “a complaint” usually need the noun.
- After to, the base verb can appear in expressions such as “to complain.”
- After did, the base form is correct: “Did you complain?”
- After has or had, the past participle is needed: “She has complained.”
Learning these patterns is more reliable than memorizing isolated sentences.
Complaint or Complain: Synonyms and Related Words
The two words have different synonyms because they perform different grammatical jobs.
Synonyms for Complaint
- Grievance: A concern about something considered unfair.
- Objection: An expression of disagreement.
- Concern: A matter causing worry or dissatisfaction.
- Criticism: An assessment that points out faults.
- Protest: An expression of strong opposition.
- Report: A statement describing an issue or event.
Example: “The employee raised a grievance about the new policy.”
Synonyms for Complain
- Object: To express disagreement.
- Protest: To express strong opposition.
- Grumble: To complain in a low or unhappy way.
- Moan: To express dissatisfaction, often informally.
- Whine: To complain in an irritating or childish manner.
- Voice concerns: To express worries or objections.
Example: “Several workers voiced concerns about the new policy.”
These words are not perfect replacements in every context. A grievance often suggests unfair treatment, while grumble is more informal. Select the term that matches the intended meaning and tone.
FAQs
1. What is the difference between complaint and complain?
Complaint is a noun that names an expression of dissatisfaction. Complain is a verb describing the act of expressing dissatisfaction.
2. Is complaint a noun or a verb?
Complaint is a noun. For example, “The manager reviewed my complaint.”
3. Is complain a noun or a verb?
Complain is a verb. For example, “I want to complain about the delay.”
4. What is the meaning of complaint in English?
A complaint is a statement or report expressing dissatisfaction with a product, service, person, or situation.
5. What does complain mean?
To complain means to express dissatisfaction, annoyance, or concern about something.
6. Is it correct to say “make a complain”?
No. The correct phrase is “make a complaint.” You can also say “complain about something.”
7. Should I say “file a complaint” or “file a complain”?
Say “file a complaint.” The noun is required in this expression.
8. What is the plural of complaint?
The plural is complaints. For example, “The office received three complaints.”
9. What is the past tense of complain?
The simple past tense is complained. For example, “She complained about the noise yesterday.”
10. How do you use complaint and complain in one sentence?
You can write: “After she made a complaint about the service, she continued to complain about the delay.”
Conclusion
The difference between complaint and complain comes down to grammar. A complaint is a concern or expression of dissatisfaction, while to complain means to express that dissatisfaction.
Write “I have a complaint” or “I filed a complaint” when referring to the concern itself. Write “I want to complain” or “She complained about the delay” when describing the action.
Remember the pattern make a complaint, file a complaint, and complain about something. These common expressions will help you avoid mistakes in everyday conversations, workplace emails, customer service messages, and formal writing.
