ace vs whiz

ace and whiz both are nouns.

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

As nouns, ace and whiz are synonyms defined as:

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

ace (noun)	whiz (noun)
a serve that the receiver is unable to reach	a buzzing or hissing sound as of something traveling rapidly through the air
one of four playing cards in a deck having a single pip on its face	someone who is dazzlingly skilled in any field
someone who is dazzlingly skilled in any field
the smallest whole number or a numeral representing this number

ace (adjective)	whiz (adjective)
of the highest quality