blabber vs gibber

blabber and gibber both are nouns.

Word	Noun	Adjective	Verb	Adverb
blabber	Yes	No	Yes	No
gibber	Yes	No	Yes	No

As verbs, blabber and gibber are synonyms defined as:

blabber and gibber: speak (about unimportant matters) rapidly and incessantly

Other synonyms of blabber include blab, chatter, clack, gabble, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle.

blabber (noun)	gibber (noun)
one who reveals confidential information to the police or other authority	unintelligible talking

blabber (verb)	gibber (verb)
speak (about unimportant matters) rapidly and incessantly	speak (about unimportant matters) rapidly and incessantly
	chatter inarticulately; of monkeys