gabble vs gibber

gabble and gibber both are nouns.

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

As nouns, gibber is a hypernym of gabble; that is, gibber is a word with a broader meaning than gabble:

Other hypernyms of gabble include gibberish.

As verbs, gabble and gibber are synonyms defined as:

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

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

gabble (noun)	gibber (noun)
rapid and indistinct speech	unintelligible talking

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