sputter vs emit

sputter is a noun but emit is not a noun.

Word	Noun	Adjective	Verb	Adverb
sputter	Yes	No	Yes	No
emit	No	No	Yes	No

As verbs, emit is a hypernym of sputter; that is, emit is a word with a broader meaning than sputter:

Other hypernyms of sputter include let loose, let out, utter.

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

sputter (verb)	emit (verb)
spit up in an explosive manner	expel (gases or odors)
cause to undergo a process in which atoms are removed	express audibly; utter sounds (not necessarily words)
utter with a spitting sound, as if in a rage	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
climb awkwardly, as if by scrambling
make an explosive sound