twaddle vs clack

twaddle and clack both are nouns.

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

As verbs, twaddle and clack are synonyms defined as:

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

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

twaddle (noun)	clack (noun)
pretentious or silly talk or writing	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

twaddle (verb)	clack (verb)
speak (about unimportant matters) rapidly and incessantly	speak (about unimportant matters) rapidly and incessantly
	make a clucking sounds, characteristic of hens
	make a rattling sound