Episcopal vs Episcopalian

Episcopal is not a noun while Episcopalian is a noun.

Word	Noun	Adjective	Verb	Adverb
Episcopal	No	Yes	No	No
Episcopalian	Yes	Yes	No	No

As adjectives, Episcopal and Episcopalian are synonyms defined as:

Episcopal and Episcopalian: of or pertaining to or characteristic of the Episcopal church

Episcopal (noun)	Episcopalian (noun)
	a member of the Episcopal church

Episcopal (adjective)	Episcopalian (adjective)
of or pertaining to or characteristic of the Episcopal church	of or pertaining to or characteristic of the Episcopal church