Complainant

n.	1.	One who makes complaint. Eager complainants of the dispute. - Collier.
	2.	(Law) One who commences a legal process by a complaint. He shall forfeit one moiety to the use of the town, and the other moiety to the use of the complainant. - Statutes of Mass.

Noun

1.

complainant - a person who brings an action in a court of law Synonyms: plaintiff

COMPLAINANT. One who makes a complaint. A plaintiff in a suit in chancery is so called.

accusant, accuser, allegator, appellant, bellyacher, claimant, complainer, crab, crank, croaker, delator, faultfinder, frondeur, griper, grouch, grouser, growler, grumbler, impeacher, impugner, indictor, informer, kicker, kvetch, libelant, malcontent, murmurer, mutterer, party, petitioner, plaintiff, prosecutor, querulous person, reactionary, reactionist, rebel, sorehead, suitor, the prosecution, whiner