custodian (n.)

• attendant
• attorney
• bailiff
• bull
• butler
• caretaker
• cerberus
• char
• charwoman
• cleaner
• commandant
• conservator
• croupier
• curator
• emcee
• factor
• gamekeeper
• gaoler
• governor
• guard
• guardian
• housekeeper
• jailer
• janitor
• keeper
• librarian
• lifeguard
• lifesaver
• overseer
• proctor
• procurator
• ranger
• screw
• seneschal
• shepherd
• steward
• supervisor
• turnkey
• warden
• warder
• watchdog