custodian
noun /kʌˈstəʊdiən/
  /kʌˈstəʊdiən/
 - a person who takes responsibility for taking care of or protecting something
- the museum’s custodians
 - a self-appointed custodian of public morals
 
 - (North American English) (British English caretaker)(also janitor North American English, Scottish English)a person whose job is to take care of a building such as a school or a block of flats or an apartment buildingTopics Educationc2, Jobsc2
 
Word Originlate 18th cent.: from custody, on the pattern of guardian.