admirer vs protagonist

admirer and protagonist both are nouns.

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

As nouns, admirer and protagonist are synonyms defined as:

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

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