indulgence vs romp

indulgence and romp both are nouns.

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

As nouns, romp is a hypernym of indulgence; that is, romp is a word with a broader meaning than indulgence:

Other hypernyms of indulgence include caper, frolic, gambol, play.

indulgence (noun)	romp (noun)
the act of indulging or gratifying a desire	gay or light-hearted recreational activity for diversion or amusement
foolish or senseless behavior	an easy victory
the remission by the pope of the temporal punishment in purgatory that is still due for sins even after absolution	a girl who behaves in a boyish manner
an inability to resist the gratification of whims and desires
a disposition to yield to the wishes of someone