yowl vs utter

yowl is a noun but utter is not a noun.

Word	Noun	Adjective	Verb	Adverb
yowl	Yes	No	Yes	No
utter	No	Yes	Yes	No

As verbs, utter is a hypernym of yowl; that is, utter is a word with a broader meaning than yowl:

Other hypernyms of yowl include emit, let loose, let out.

yowl (noun)	utter (noun)
a very loud utterance (like the sound of an animal)

yowl (adjective)	utter (adjective)
	complete and absolute
	without qualification; used informally as (often pejorative) intensifiers

yowl (verb)	utter (verb)
utter shrieks, as of cats	express in speech
cry loudly, as of animals	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation