verifier vs protagonist

verifier and protagonist both are nouns.

Word	Noun	Adjective	Verb	Adverb
verifier	Yes	No	No	No
protagonist	Yes	No	No	No

As nouns, protagonist is a hypernym of verifier; that is, protagonist is a word with a broader meaning than verifier:

verifier: someone who vouches for another or for the correctness of a statement
protagonist: a person who backs a politician or a team etc.

Other hypernyms of verifier include admirer, booster, champion, friend, supporter.

verifier (noun)	protagonist (noun)
someone who vouches for another or for the correctness of a statement	a person who backs a politician or a team etc.
	the principal character in a work of fiction