chatter vs utter

chatter is a noun but utter is not a noun.

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

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

Other hypernyms of chatter include mouth, speak, talk, verbalise, verbalize.

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

Other hypernyms of chatter include mouth, speak, talk, verbalise, verbalize.

chatter (noun)	utter (noun)
noisy talk
the high-pitched continuing noise made by animals (birds or monkeys)
the rapid series of noises made by the parts of a machine

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

chatter (verb)	utter (verb)
speak (about unimportant matters) rapidly and incessantly	express in speech
talk socially without exchanging too much information	articulate; either verbally or with a cry, shout, or noise
make noise as if chattering away	express audibly; utter sounds (not necessarily words)
cut unevenly with a chattering tool	put into circulation
click repeatedly or uncontrollably