indulgence vs japery

indulgence and japery both are nouns.

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

As nouns, japery is a hyponym of indulgence; that is, japery is a word with a more specific, narrower meaning than indulgence:

Other hyponyms of indulgence include meshugaas, mishegaas, mishegoss, buffoonery, clowning, frivolity, harlequinade, prank.

indulgence (noun)	japery (noun)
the act of indulging or gratifying a desire	acting like a clown or buffoon
foolish or senseless behavior
the remission by the pope of the temporal punishment in purgatory that is still due for sins even after absolution
an inability to resist the gratification of whims and desires
a disposition to yield to the wishes of someone