whisperer vs verbalizer

whisperer and verbalizer both are nouns.

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

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

whisperer: one who speaks in a whisper
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

whisperer (noun)	verbalizer (noun)
one who speaks in a whisper	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)