blather vs piffle

blather and piffle both are nouns.

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

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

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

blather (noun)	piffle (noun)
foolish gibberish	trivial nonsense

blather (verb)	piffle (verb)
to talk foolishly	act in a trivial or ineffective way
	speak (about unimportant matters) rapidly and incessantly