chatterer vs verbalizer

chatterer and verbalizer both are nouns.

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

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

chatterer: an obnoxious and foolish and loquacious talker
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

chatterer (noun)	verbalizer (noun)
passerine bird of New World tropics	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
an obnoxious and foolish and loquacious talker