well-wisher vs champion

well-wisher and champion both are nouns.

Word	Noun	Adjective	Verb	Adverb
well-wisher	Yes	No	No	No
champion	Yes	Yes	Yes	No

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

well-wisher: someone who shares your feelings or opinions and hopes that you will be successful
champion: a person who backs a politician or a team etc.

Other hypernyms of well-wisher include admirer, booster, friend, protagonist, supporter.

well-wisher (noun)	champion (noun)
someone who shares your feelings or opinions and hopes that you will be successful	someone who fights for a cause
	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

well-wisher (adjective)	champion (adjective)
	holding first place in a contest

well-wisher (verb)	champion (verb)
	protect or fight for as a champion