buffoonery vs japery

buffoonery and japery both are nouns.

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

As nouns, buffoonery and japery are synonyms defined as:

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

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