self-indulgence vs jag

self-indulgence and jag both are nouns.

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

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

self-indulgence: excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence
jag: a bout of drinking or drug taking

Other hyponyms of self-indulgence include fling, spree, dissipation, dissolution, licentiousness, looseness, profligacy.

self-indulgence (noun)	jag (noun)
excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence	a bout of drinking or drug taking
an inability to resist the gratification of whims and desires	a flap along the edge of a garment; used in medieval clothing
	a slit in a garment that exposes material of a different color underneath; used in Renaissance clothing
	a sharp projection on an edge or surface

self-indulgence (verb)	jag (verb)
	cut teeth into; make a jagged cutting edge