Holy Order vs deacon

Holy Order and deacon both are nouns.

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

As nouns, deacon is a hyponym of Holy Order; that is, deacon 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
deacon: a cleric ranking just below a priest in Christian churches; one of the Holy Orders

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

Holy Order (noun)	deacon (noun)
(usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarchy	a cleric ranking just below a priest in Christian churches; one of the Holy Orders
	a Protestant layman who assists the minister