piffle vs acquit

piffle is a noun but acquit is not a noun.

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

As verbs, acquit is a hypernym of piffle; that is, acquit is a word with a broader meaning than piffle:

piffle: act in a trivial or ineffective way
acquit: behave in a certain manner; show a certain behavior; conduct or comport oneself

Other hypernyms of piffle include act, bear, behave, carry, comport, conduct, deport, do.

piffle (noun)	acquit (noun)
trivial nonsense

piffle (verb)	acquit (verb)
act in a trivial or ineffective way	behave in a certain manner; show a certain behavior; conduct or comport oneself
speak (about unimportant matters) rapidly and incessantly	pronounce not guilty of criminal charges