blather vs twaddle

blather and twaddle both are nouns.

Word	Noun	Adjective	Verb	Adverb
blather	Yes	No	Yes	No
twaddle	Yes	No	Yes	No

As verbs, twaddle is a hypernym of blather; that is, twaddle is a word with a broader meaning than blather:

Other hypernyms of blather include blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle.

blather (noun)	twaddle (noun)
foolish gibberish	pretentious or silly talk or writing

blather (verb)	twaddle (verb)
to talk foolishly	speak (about unimportant matters) rapidly and incessantly