japery vs buffoonery

japery and buffoonery both are nouns.

Word	Noun	Adjective	Verb	Adverb
japery	Yes	No	No	No
buffoonery	Yes	No	No	No

As nouns, japery and buffoonery are synonyms defined as:

Other synonyms of japery include clowning, frivolity, harlequinade, prank.

japery (noun)	buffoonery (noun)
acting like a clown or buffoon	acting like a clown or buffoon