prelate vs archpriest

prelate and archpriest both are nouns.

Word	Noun	Adjective	Verb	Adverb
prelate	Yes	No	No	No
archpriest	Yes	No	No	No

As nouns, prelate and archpriest are synonyms defined as:

Other synonyms of prelate include hierarch, high priest, primate.

prelate (noun)	archpriest (noun)
a senior clergyman and dignitary	a senior clergyman and dignitary