litigant vs complainant

litigant and complainant both are nouns.

Word	Noun	Adjective	Verb	Adverb
litigant	Yes	No	No	No
complainant	Yes	No	No	No

As nouns, complainant is a hyponym of litigant; that is, complainant is a word with a more specific, narrower meaning than litigant:

Other hyponyms of litigant include defendant, suspect, appellant, plaintiff in error, filer, plaintiff, prevailing party.

litigant (noun)	complainant (noun)
(law) a party to a lawsuit; someone involved in litigation	a person who brings an action in a court of law