rhetorician vs verbaliser

rhetorician and verbaliser both are nouns.

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

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

rhetorician: a person who delivers a speech or oration
verbaliser: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

rhetorician (noun)	verbaliser (noun)
a person who delivers a speech or oration	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)