enthusiast vs protagonist

enthusiast and protagonist both are nouns.

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

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

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

enthusiast (noun)	protagonist (noun)
an ardent and enthusiastic supporter of some person or activity	a person who backs a politician or a team etc.
a person having a strong liking for something	the principal character in a work of fiction