champ vs champion

champ and champion both are nouns.

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

As nouns, champ and champion are synonyms defined as:

Other synonyms of champ include title-holder.

champ (noun)	champion (noun)
someone who has won first place in a competition	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

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

champ (verb)	champion (verb)
chew noisily or vigorously	protect or fight for as a champion
chafe at the bit, like horses