champion vs prizewinning

champion is a noun but prizewinning is not a noun.

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

As adjectives, champion and prizewinning are synonyms defined as:

champion (noun)	prizewinning (noun)
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

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

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