Holy Order vs exorcist

Holy Order and exorcist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Order	Yes	No	No	No
exorcist	Yes	No	No	No

As nouns, exorcist is a hyponym of Holy Order; that is, exorcist is a word with a more specific, narrower meaning than Holy Order:

Holy Order: (usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarchy
exorcist: one of the minor orders in the unreformed Western Church but now suppressed in the Roman Catholic Church

Other hyponyms of Holy Order include acolyte, anagnost, deacon, doorkeeper, ostiarius, ostiary, lector, reader, priest, subdeacon.

Holy Order (noun)	exorcist (noun)
(usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarchy	someone who practices exorcism
	one of the minor orders in the unreformed Western Church but now suppressed in the Roman Catholic Church