ostiary vs hall porter

ostiary and hall porter both are nouns.

Word	Noun	Adjective	Verb	Adverb
ostiary	Yes	No	No	No
hall porter	Yes	No	No	No

As nouns, ostiary and hall porter are synonyms defined as:

Other synonyms of ostiary include door guard, doorkeeper, doorman, gatekeeper, porter.

ostiary (noun)	hall porter (noun)
someone who guards an entrance	someone who guards an entrance
the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church