ululation vs vocalization

ululation and vocalization both are nouns.

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

As nouns, vocalization is a hypernym of ululation; that is, vocalization is a word with a broader meaning than ululation:

Other hypernyms of ululation include utterance.

ululation (noun)	vocalization (noun)
a long loud emotional utterance	the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
	the use of uttered sounds for auditory communication