whiz vs whir

whiz and whir both are nouns.

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

As verbs, whiz and whir are synonyms defined as:

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

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

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