gibber vs clack

gibber and clack both are nouns.

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

As verbs, gibber and clack are synonyms defined as:

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

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

gibber (noun)	clack (noun)
unintelligible talking	a simple valve with a hinge on one side; allows fluid to flow in only one direction
	a sharp abrupt noise as if two objects hit together; may be repeated

gibber (verb)	clack (verb)
speak (about unimportant matters) rapidly and incessantly	speak (about unimportant matters) rapidly and incessantly
chatter inarticulately; of monkeys	make a clucking sounds, characteristic of hens
	make a rattling sound