driveller vs speaker

driveller and speaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
driveller	Yes	No	No	No
speaker	Yes	No	No	No

As nouns, speaker is a hypernym of driveller; that is, speaker is a word with a broader meaning than driveller:

driveller: someone whose talk is trivial drivel
speaker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of driveller include talker, utterer, verbaliser, verbalizer.

driveller (noun)	speaker (noun)
someone whose talk is trivial drivel	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
a person who dribbles	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)