(n.) A door-keeper; a porter; one who has the care of a public building, or a building occupied for offices, suites of rooms, etc.

air warden attendant caretaker castellan cerberus char charwoman cleaner cleaner-off cleaner-up cleaning lady cleaning man cleaning woman concierge conservator curator custodian doorkeeper doorman forest ranger game warden gamekeeper gatekeeper governor guardian guardian angel janitress keeper lifeguard lifesaver next friend ostiary porter prochein ami ranger receptionist shepherd steward usher warden warder