vociferator vs verbalizer

vociferator and verbalizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
vociferator	Yes	No	No	No
verbalizer	Yes	No	No	No

As nouns, verbalizer is a hypernym of vociferator; that is, verbalizer is a word with a broader meaning than vociferator:

vociferator: a loud and vehement speaker (usually in protest)
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of vociferator include speaker, talker, utterer, verbaliser.

vociferator (noun)	verbalizer (noun)
a loud and vehement speaker (usually in protest)	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)