Plaintiff is a noun.
In a civil case, a judgment can be granted in part or in whole. If a plaintiff sues for $100, and the court finds in favor of the plaintiff, but does not believe the plaintiff is indebted the full $100, the court can grant judgment in part to the plaintiff of, say, $60.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The Plaintiff.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.