Complaint vs. Complainant — What's the Difference?

In legal terminology, a complaint is any formal legal document that sets out the facts and legal reasons (see: cause of action) that the filing party or parties (the plaintiff(s)) believes are sufficient to support a claim against the party or parties against whom the claim is brought (the defendant(s)) that entitles the plaintiff(s) to a remedy (either money damages or injunctive relief). For example, the Federal Rules of Civil Procedure (FRCP) that govern civil litigation in United States courts provide that a civil action is commenced with the filing or service of a pleading called a complaint.

A plaintiff in certain lawsuits.

An expression of pain, dissatisfaction, or resentment.

A plaintiff.

A cause or reason for complaining; a grievance

A prosecuting witness in a criminal case.

A bodily disorder or disease; a malady or ailment.

A person who files a formal accusation or brings a formal charge.

The symptom or distress about which a patient seeks medical assistance.

(legal) The party that brings a civil lawsuit against another; the plaintiff.

A formal statement initiating a lawsuit by specifying the facts and legal grounds for the relief sought.

(legal) An alleged victim in a criminal investigation or trial.

A formal charge, made under oath, of the commission of a crime or other such offense.

One who makes complaint.

The act of complaining.

One who makes complaint.

A grievance, problem, difficulty, or concern.

One who commences a legal process by a complaint.

(legal) In a civil action, the first pleading of the plaintiff setting out the facts on which the claim is based;
The purpose is to give notice to the adversary of the nature and basis of the claim asserted.

A person who brings an action in a court of law

(legal) In criminal law, the preliminary charge or accusation made by one person against another to the appropriate court or officer, usually a magistrate.
However, court proceedings, such as a trial, cannot be instituted until an indictment or information has been handed down against the defendant.

A bodily disorder or disease; the symptom of such a disorder.

Expression of grief, regret, pain, censure, or resentment; lamentation; murmuring; accusation; fault-finding.

Cause or subject of complaint or murmuring.

An ailment or disease of the body.

A formal allegation or charge against a party made or presented to the appropriate court or officer, as for a wrong done or a crime committed (in the latter case, generally under oath); an information; accusation; the initial bill in proceedings in equity.

An often persistent bodily disorder or disease; a cause for complaining

(formerly) a loud cry (or repeated cries) of pain or rage or sorrow

An expression of grievance or resentment

(civil law) the first pleading of the plaintiff setting out the facts on which the claim for relief is based

(criminal law) a pleading describing some wrong or offense;