indulgence vs undiscipline

indulgence and undiscipline both are nouns.

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

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

Other hypernyms of indulgence include indiscipline.

indulgence (noun)	undiscipline (noun)
the act of indulging or gratifying a desire	the trait of lacking discipline
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