voicer vs verbalizer

voicer and verbalizer both are nouns.

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

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

voicer: a speaker who voices an opinion
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

voicer (noun)	verbalizer (noun)
a speaker who voices an opinion	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
someone who regulates the tone of organ pipes