japery vs harlequinade

japery and harlequinade both are nouns.

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

As nouns, japery and harlequinade are synonyms defined as:

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

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