gatekeeper vs hall porter

gatekeeper and hall porter both are nouns.

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

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

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

gatekeeper (noun)	hall porter (noun)
someone who guards an entrance	someone who guards an entrance
someone who controls access to something