howling vs vocalization

howling and vocalization both are nouns.

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

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

Other hypernyms of howling include utterance.

howling (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
	the use of uttered sounds for auditory communication

howling (adjective)	vocalization (adjective)
extraordinarily good or great; used especially as intensifiers