whir vs whiz

whir and whiz both are nouns.

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

As verbs, whir and whiz are synonyms defined as:

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

whir (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

whir (verb)	whiz (verb)
make a soft swishing sound	make a soft swishing sound