archdiocese vs episcopate

archdiocese and episcopate both are nouns.

Word	Noun	Adjective	Verb	Adverb
archdiocese	Yes	No	No	No
episcopate	Yes	No	No	No

As nouns, episcopate is a hypernym of archdiocese; that is, episcopate is a word with a broader meaning than archdiocese:

Other hypernyms of archdiocese include bishopric, diocese.

archdiocese (noun)	episcopate (noun)
the diocese of an archbishop	the office and dignity of a bishop
	the collective body of bishops
	the territorial jurisdiction of a bishop
	the term of office of a bishop