blather vs chatter

blather and chatter both are nouns.

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

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

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

blather (noun)	chatter (noun)
foolish gibberish	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

blather (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