gatekeeper vs doorman

gatekeeper and doorman both are nouns.

Word	Noun	Adjective	Verb	Adverb
gatekeeper	Yes	No	No	No
doorman	Yes	No	No	No

As nouns, gatekeeper and doorman are synonyms defined as:

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

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