howl vs vocalization

howl and vocalization both are nouns.

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

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

Other hypernyms of howl include utterance.

howl (noun)	vocalization (noun)
a long loud emotional utterance	the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
a loud sustained noise resembling the cry of a hound	the use of uttered sounds for auditory communication
the long plaintive cry of a hound or a wolf

howl (verb)	vocalization (verb)
laugh unrestrainedly and heartily
make a loud noise, as of wind, water, or vehicles
emit long loud cries
cry loudly, as of animals