questioner vs verbaliser

questioner and verbaliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
questioner	Yes	No	No	No
verbaliser	Yes	No	No	No

As nouns, verbaliser is a hypernym of questioner; that is, verbaliser is a word with a broader meaning than questioner:

questioner: someone who asks a question
verbaliser: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of questioner include speaker, talker, utterer, verbalizer.

questioner (noun)	verbaliser (noun)
someone who asks a question	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)