telephoner vs verbalizer

telephoner and verbalizer both are nouns.

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

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

telephoner: the person initiating a telephone call
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

telephoner (noun)	verbalizer (noun)
the person initiating a telephone call	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)