(n.) One who has care or custody, as of some public building; a keeper or superintendent.

MC air warden attendant attorney bailiff bull butler caretaker castellan cerberus char charwoman cleaner cleaner-off cleaner-up cleaning lady cleaning man cleaning woman commandant conservator croupier curator custos emcee factor forest ranger game warden gamekeeper gaoler governor guard guardian guardian angel housekeeper jailer janitor janitress keeper landreeve librarian lifeguard lifesaver majordomo master of ceremonies next friend overseer principal keeper prison guard prochein ami proctor procurator ranger screw seneschal shepherd steward supervisor turnkey warden warder watchdog