champ vs rival

champ and rival both are nouns.

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

As nouns, rival is a hypernym of champ; that is, rival is a word with a broader meaning than champ:

Other hypernyms of champ include challenger, competition, competitor, contender.

champ (noun)	rival (noun)
someone who has won first place in a competition	the contestant you hope to defeat

champ (adjective)	rival (adjective)
	as a rival in a competition

champ (verb)	rival (verb)
chew noisily or vigorously	be the rival of, be in competition with
chafe at the bit, like horses	be equal to in quality or ability