utter vs utterance

utter is not a noun while utterance is a noun.

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

utter (noun)	utterance (noun)
	the use of uttered sounds for auditory communication

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

utter (verb)	utterance (verb)
express in speech
articulate; either verbally or with a cry, shout, or noise
express audibly; utter sounds (not necessarily words)
put into circulation