splutter vs utter

splutter is a noun but utter is not a noun.

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

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

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

splutter (noun)	utter (noun)
an utterance (of words) with spitting sounds (as in rage)
the noise of something spattering or sputtering explosively

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

splutter (verb)	utter (verb)
spit up in an explosive manner	express in speech
utter with a spitting sound, as if in a rage	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation