blether vs tittle-tattle

blether and tittle-tattle both are nouns.

Word	Noun	Adjective	Verb	Adverb
blether	Yes	No	Yes	No
tittle-tattle	Yes	No	Yes	No

As verbs, tittle-tattle is a hypernym of blether; that is, tittle-tattle is a word with a broader meaning than blether:

Other hypernyms of blether include blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, twaddle.

blether (noun)	tittle-tattle (noun)
idle or foolish and irrelevant talk	light informal conversation for social occasions

blether (verb)	tittle-tattle (verb)
to talk foolishly	speak (about unimportant matters) rapidly and incessantly