Complaint vs Lawsuit

When to use each in English, with meaning, register, and examples.

 ComplaintLawsuit
MeaningA statement saying that something is wrong or not good.A legal case someone brings to court.
Register-formal
CEFR levelB1C1
Part of speechnounnoun
Usage notesUse 'complaint' in contexts where someone expresses dissatisfaction. It's appropriate in both spoken and written forms but should be avoided in very casual settings.Used in formal contexts, particularly in legal discussions. Not appropriate in casual conversations. Common in news articles about legal matters.

Frequently asked questions: Complaint vs Lawsuit

What's the difference between "Complaint" and "Lawsuit"?

"Complaint" means: A statement saying that something is wrong or not good. "Lawsuit" means: A legal case someone brings to court.

When should I use "Complaint" and "Lawsuit"?

"Lawsuit" is formal.

Are "Complaint" and "Lawsuit" the same CEFR level?

"Complaint" is at B1, "Lawsuit" is at C1 on the CEFR scale.

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