cough out vs splutter

cough out is not a noun while splutter is a noun.

Word	Noun	Adjective	Verb	Adverb
cough out	No	No	Yes	No
splutter	Yes	No	Yes	No

As verbs, splutter is a hyponym of cough out; that is, splutter is a word with a more specific, narrower meaning than cough out:

Other hyponyms of cough out include cough, ptyalise, ptyalize, spew, spit, spue, spit out, sputter.

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

cough out (verb)	splutter (verb)
discharge (phlegm or sputum) from the lungs and out of the mouth	spit up in an explosive manner
	utter with a spitting sound, as if in a rage