maunder vs gibber

maunder is not a noun while gibber is a noun.

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

As verbs, maunder and gibber are synonyms defined as:

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

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

maunder (noun)	gibber (noun)
	unintelligible talking

maunder (verb)	gibber (verb)
talk indistinctly; usually in a low voice	speak (about unimportant matters) rapidly and incessantly
speak (about unimportant matters) rapidly and incessantly	chatter inarticulately; of monkeys
wander aimlessly