noun one having charge of buildings or grounds or animals.
— synonyms: keeper, steward
Examples
“After their parents' death, their aunt became the children's custodian.”
“The custodian does such admirable work, deftly wielding a mop to keep our hallways and sidewalks free of buai pekpek left by people who chew betelnuts to be "cool" but don't even bother finding a rubbish bin or spit cup to dispose of the pekpek with.”