rejection vs organic phenomenon

rejection and organic phenomenon both are nouns.

Word	Noun	Adjective	Verb	Adverb
rejection	Yes	No	No	No
organic phenomenon	Yes	No	No	No

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

rejection: (medicine) an immunological response that refuses to accept substances or organisms that are recognized as foreign
organic phenomenon: (biology) a natural phenomenon involving living plants and animals

rejection (noun)	organic phenomenon (noun)
the act of rejecting something	(biology) a natural phenomenon involving living plants and animals
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