reject vs rejection

reject and rejection both are nouns.

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

reject (noun)	rejection (noun)
the person or thing that is rejected or set aside as inferior in quality	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

reject (verb)	rejection (verb)
not accept something given or offered
dismiss from consideration or a contest
deem wrong or inappropriate
reject with contempt
not accept as true
refuse entrance or membership
resist immunologically the introduction of some foreign tissue or organ