whirr vs utter

whirr is a noun but utter is not a noun.

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

As verbs, utter is a hypernym of whirr; that is, utter is a word with a broader meaning than whirr:

Other hypernyms of whirr include emit, let loose, let out.

whirr (noun)	utter (noun)
sound of something in rapid motion

whirr (adjective)	utter (adjective)
	complete and absolute
	without qualification; used informally as (often pejorative) intensifiers

whirr (verb)	utter (verb)
make a vibrant sound, as of some birds	express in speech
make a soft swishing sound	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation