piffle vs clack

piffle and clack both are nouns.

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

As verbs, piffle and clack are synonyms defined as:

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

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

piffle (noun)	clack (noun)
trivial nonsense	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

piffle (verb)	clack (verb)
act in a trivial or ineffective way	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