custodian
noun
[ kʌˈstəʊdɪən ]
• a person who has responsibility for taking care of or protecting something.
• "the custodians of pension and insurance funds"
Similar:
curator,
keeper,
conservator,
guardian,
overseer,
superintendent,
caretaker,
steward,
warden,
attendant,
watchdog,
protector,
defender,
warder,
Origin:
late 18th century: from custody, on the pattern of guardian .