prattle vs clack

prattle and clack both are nouns.

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

As verbs, prattle and clack are synonyms defined as:

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

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

prattle (noun)	clack (noun)
idle or foolish and irrelevant talk	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

prattle (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