clack vs prattle

clack and prattle both are nouns.

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

As verbs, clack and prattle are synonyms defined as:

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

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

clack (noun)	prattle (noun)
a simple valve with a hinge on one side; allows fluid to flow in only one direction	idle or foolish and irrelevant talk
a sharp abrupt noise as if two objects hit together; may be repeated

clack (verb)	prattle (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