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.
what part of speech is beneath
adverb
The Plaintiff.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech for "breezy" is an adjective.
The part of speech for "buried" is a verb.