forgoing vs rejection

forgoing and rejection both are nouns.

Word	Noun	Adjective	Verb	Adverb
forgoing	Yes	No	No	No
rejection	Yes	No	No	No

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

forgoing: the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)
rejection: the act of rejecting something

forgoing (noun)	rejection (noun)
the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)	the act of rejecting something
	the speech act of rejecting
	(medicine) an immunological response that refuses to accept substances or organisms that are recognized as foreign
	the state of being rejected