whiz vs champion

whiz and champion both are nouns.

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

As nouns, whiz and champion are synonyms defined as:

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

whiz (noun)	champion (noun)
a buzzing or hissing sound as of something traveling rapidly through the air	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

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

whiz (verb)	champion (verb)
make a soft swishing sound	protect or fight for as a champion