champion vs whizz

champion and whizz both are nouns.

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

As nouns, champion and whizz are synonyms defined as:

Other synonyms of champion include ace, adept, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, wiz, wizard.

champion (noun)	whizz (noun)
someone who fights for a cause	someone who is dazzlingly skilled in any field
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)	whizz (adjective)
holding first place in a contest

champion (verb)	whizz (verb)
protect or fight for as a champion	move along very quickly
	make a soft swishing sound