competition vs champ

competition and champ both are nouns.

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

As nouns, champ is a hyponym of competition; that is, champ is a word with a more specific, narrower meaning than competition:

competition (noun)	champ (noun)
the act of competing as for profit or a prize	someone who has won first place in a competition
an occasion on which a winner is selected from among two or more contestants
the contestant you hope to defeat
a business relation in which two parties compete to gain customers

competition (verb)	champ (verb)
	chew noisily or vigorously
	chafe at the bit, like horses