orator vs utterer

orator and utterer both are nouns.

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

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

orator: a person who delivers a speech or oration
utterer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of orator include speaker, talker, verbaliser, verbalizer.

orator (noun)	utterer (noun)
a person who delivers a speech or oration	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