champion vs admirer

champion and admirer both are nouns.

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

As nouns, champion and admirer are synonyms defined as:

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

champion (noun)	admirer (noun)
someone who fights for a cause	someone who admires a young woman
someone who has won first place in a competition	a person who backs a politician or a team etc.
a person who backs a politician or a team etc.	a person who admires; someone who esteems or respects or approves
someone who is dazzlingly skilled in any field

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

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