self-denial vs self-sacrifice

self-denial and self-sacrifice both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-denial	Yes	No	No	No
self-sacrifice	Yes	No	No	No

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

self-denial: renunciation of your own interests in favor of the interests of others
self-sacrifice: acting with less concern for yourself than for the success of the joint activity

Other hypernyms of self-denial include forgoing, forswearing, renunciation, selflessness.

self-denial (noun)	self-sacrifice (noun)
the act of denying yourself; controlling your impulses	acting with less concern for yourself than for the success of the joint activity
renunciation of your own interests in favor of the interests of others
the trait of practicing self discipline