self-indulgence vs undiscipline

self-indulgence and undiscipline both are nouns.

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

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

self-indulgence: an inability to resist the gratification of whims and desires
undiscipline: the trait of lacking discipline

Other hypernyms of self-indulgence include indiscipline.

self-indulgence (noun)	undiscipline (noun)
excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence	the trait of lacking discipline
an inability to resist the gratification of whims and desires