whirr vs whiz

whirr and whiz both are nouns.

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

As verbs, whirr and whiz are synonyms defined as:

Other synonyms of whirr include birr, purr, whir, whizz.

whirr (noun)	whiz (noun)
sound of something in rapid motion	a buzzing or hissing sound as of something traveling rapidly through the air
	someone who is dazzlingly skilled in any field

whirr (verb)	whiz (verb)
make a vibrant sound, as of some birds	make a soft swishing sound
make a soft swishing sound