expectorate vs splutter

expectorate is not a noun while splutter is a noun.

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

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

expectorate: discharge (phlegm or sputum) from the lungs and out of the mouth
splutter: spit up in an explosive manner

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

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

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