splutter vs vocalization

splutter and vocalization both are nouns.

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

As nouns, vocalization is a hypernym of splutter; that is, vocalization is a word with a broader meaning than splutter:

Other hypernyms of splutter include utterance.

splutter (noun)	vocalization (noun)
an utterance (of words) with spitting sounds (as in rage)	the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
the noise of something spattering or sputtering explosively	the use of uttered sounds for auditory communication

splutter (verb)	vocalization (verb)
spit up in an explosive manner
utter with a spitting sound, as if in a rage