/kʌˈstoʊdiən/
cus·to·dian
BrE /kʌˈstəʊdiən/
NAmE /kʌˈstoʊdiən/
a person who takes responsibility for taking care of or protecting sth
the museum’s custodians
a self-appointed custodian of public morals
(NAmE) (BrE care·taker) (NAmE also , ScotE jani·tor)
a person whose job is to take care of a building such as a school or a block of flats or an apartment building