jabberer vs utterer

jabberer and utterer both are nouns.

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

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

jabberer: someone whose talk is trivial drivel
utterer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

jabberer (noun)	utterer (noun)
someone whose talk is trivial drivel	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