self-abnegation vs forgoing

self-abnegation and forgoing both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-abnegation	Yes	No	No	No
forgoing	Yes	No	No	No

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

self-abnegation: renunciation of your own interests in favor of the interests of others
forgoing: the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)

Other hypernyms of self-abnegation include forswearing, renunciation, self-sacrifice, selflessness.

self-abnegation (noun)	forgoing (noun)
renunciation of your own interests in favor of the interests of others	the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)