howling vs utterance

howling and utterance both are nouns.

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

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

Other hypernyms of howling include vocalization.

howling (noun)	utterance (noun)
a long loud emotional utterance	the use of uttered sounds for auditory communication

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