clergy vs priesthood

clergy and priesthood both are nouns.

Word	Noun	Adjective	Verb	Adverb
clergy	Yes	No	No	No
priesthood	Yes	No	No	No

As nouns, priesthood is a hypernym of clergy; that is, priesthood is a word with a broader meaning than clergy:

clergy: in Christianity, clergymen collectively (as distinguished from the laity)
priesthood: the body of ordained religious practitioners

clergy (noun)	priesthood (noun)
in Christianity, clergymen collectively (as distinguished from the laity)	the body of ordained religious practitioners