repudiation vs rejection

repudiation and rejection both are nouns.

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

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

repudiation (noun)	rejection (noun)
the exposure of falseness or pretensions	the act of rejecting something
rejecting or disowning or disclaiming as invalid	the speech act of rejecting
refusal to acknowledge or pay a debt or honor a contract (especially by public authorities)	(medicine) an immunological response that refuses to accept substances or organisms that are recognized as foreign
	the state of being rejected