falter vs utter

falter is a noun but utter is not a noun.

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

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

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

falter (noun)	utter (noun)
the act of pausing uncertainly

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

falter (verb)	utter (verb)
speak haltingly	express in speech
walk unsteadily, tripping repeatedly	articulate; either verbally or with a cry, shout, or noise
move hesitatingly, as if about to give way	express audibly; utter sounds (not necessarily words)
be unsure or weak	put into circulation