forsaking vs rejection

forsaking and rejection both are nouns.

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

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

forsaking (noun)	rejection (noun)
the act of giving something up	the act of rejecting something
the act of forsaking	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