clack vs piffle

clack and piffle both are nouns.

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

As verbs, clack and piffle are synonyms defined as:

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

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

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

clack (verb)	piffle (verb)
speak (about unimportant matters) rapidly and incessantly	act in a trivial or ineffective way
make a clucking sounds, characteristic of hens	speak (about unimportant matters) rapidly and incessantly
make a rattling sound