protagonist vs admirer

protagonist and admirer both are nouns.

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

As nouns, protagonist and admirer are synonyms defined as:

Other synonyms of protagonist include booster, champion, friend, supporter.

protagonist (noun)	admirer (noun)
a person who backs a politician or a team etc.	someone who admires a young woman
the principal character in a work of fiction	a person who backs a politician or a team etc.
	a person who admires; someone who esteems or respects or approves