episcopate vs episcopacy

episcopate and episcopacy both are nouns.

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

As nouns, episcopate and episcopacy are synonyms defined as:

episcopate (noun)	episcopacy (noun)
the office and dignity of a bishop	the collective body of bishops
the collective body of bishops
the territorial jurisdiction of a bishop
the term of office of a bishop