excommunication vs rejection

excommunication and rejection both are nouns.

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

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

excommunication (noun)	rejection (noun)
the act of banishing a member of a church from the communion of believers and the privileges of the church; cutting a person off from a religious society	the act of rejecting something
the state of being excommunicated	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