stutterer vs verbaliser

stutterer and verbaliser both are nouns.

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

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

stutterer: someone who speaks with involuntary pauses and repetitions
verbaliser: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

stutterer (noun)	verbaliser (noun)
someone who speaks with involuntary pauses and repetitions	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)