blather vs prattle

blather and prattle both are nouns.

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

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

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

blather (noun)	prattle (noun)
foolish gibberish	idle or foolish and irrelevant talk

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