gibber vs blabber

gibber and blabber both are nouns.

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

As verbs, gibber and blabber are synonyms defined as:

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

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

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

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