gibber vs maunder

gibber is a noun but maunder is not a noun.

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

As verbs, gibber and maunder are synonyms defined as:

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

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

gibber (noun)	maunder (noun)
unintelligible talking

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