vociferator vs utterer

vociferator and utterer both are nouns.

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

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

vociferator: a loud and vehement speaker (usually in protest)
utterer: 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, verbaliser, verbalizer.

vociferator (noun)	utterer (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)
	someone who circulates forged banknotes or counterfeit coins
	an organism that can utter vocal sounds