yowl vs emit

yowl is a noun but emit is not a noun.

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

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

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

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

yowl (verb)	emit (verb)
utter shrieks, as of cats	expel (gases or odors)
cry loudly, as of animals	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.