murmurer vs verbaliser

murmurer and verbaliser both are nouns.

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

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

murmurer: a person who speaks softly and indistinctly
verbaliser: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

murmurer (noun)	verbaliser (noun)
a person who speaks softly and indistinctly	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)