howl vs ululation

howl and ululation both are nouns.

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

As nouns, howl and ululation are synonyms defined as:

Other synonyms of howl include howling.

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