enthusiast vs champion

enthusiast and champion both are nouns.

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

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

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

enthusiast (noun)	champion (noun)
an ardent and enthusiastic supporter of some person or activity	someone who fights for a cause
a person having a strong liking for something	someone who has won first place in a competition
	a person who backs a politician or a team etc.
	someone who is dazzlingly skilled in any field

enthusiast (adjective)	champion (adjective)
	holding first place in a contest

enthusiast (verb)	champion (verb)
	protect or fight for as a champion