purr vs whiz

purr and whiz both are nouns.

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

As verbs, purr and whiz are synonyms defined as:

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

purr (noun)	whiz (noun)
a low vibrating sound typical of a contented cat	a buzzing or hissing sound as of something traveling rapidly through the air
	someone who is dazzlingly skilled in any field

purr (verb)	whiz (verb)
indicate pleasure by purring; characteristic of cats	make a soft swishing sound
make a soft swishing sound