blether vs chatter

blether and chatter both are nouns.

Word	Noun	Adjective	Verb	Adverb
blether	Yes	No	Yes	No
chatter	Yes	No	Yes	No

As nouns, chatter is a hypernym of blether; that is, chatter is a word with a broader meaning than blether:

Other hypernyms of blether include cackle, yack, yak, yakety-yak.

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

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

blether (noun)	chatter (noun)
idle or foolish and irrelevant talk	noisy talk
	the high-pitched continuing noise made by animals (birds or monkeys)
	the rapid series of noises made by the parts of a machine

blether (verb)	chatter (verb)
to talk foolishly	speak (about unimportant matters) rapidly and incessantly
	talk socially without exchanging too much information
	make noise as if chattering away
	cut unevenly with a chattering tool
	click repeatedly or uncontrollably