howl vs yaup

howl is a noun but yaup is not a noun.

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

As verbs, howl and yaup are synonyms defined as:

Other synonyms of howl include roar, ululate, wail, yawl.

howl (noun)	yaup (noun)
a long loud emotional utterance
a loud sustained noise resembling the cry of a hound
the long plaintive cry of a hound or a wolf

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