ostiarius vs doorkeeper

ostiarius and doorkeeper both are nouns.

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

As nouns, ostiarius and doorkeeper are synonyms defined as:

ostiarius and doorkeeper: the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church

Other synonyms of ostiarius include ostiary.

ostiarius (noun)	doorkeeper (noun)
the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church	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