Order vs doorkeeper

Order and doorkeeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Order	Yes	No	No	No
doorkeeper	Yes	No	No	No

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

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

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

Order (noun)	doorkeeper (noun)
(usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarchy	someone who guards an entrance
	an official stationed at the entrance of a courtroom or legislative chamber
	the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church