indulgence vs lunacy

indulgence and lunacy both are nouns.

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

As nouns, indulgence and lunacy are synonyms defined as:

Other synonyms of indulgence include craziness, folly, foolery, tomfoolery.

indulgence (noun)	lunacy (noun)
the act of indulging or gratifying a desire	foolish or senseless behavior
foolish or senseless behavior	obsolete terms for legal insanity
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