keeper
noun [ C ]
uk/ˈkiːpər/ usa person who takes care of animals, buildings, etc. or is in charge of valuable objects or information:
He is the organization's official record keeper.
an assistant keeper at the museum
informal
something that is worth keeping:
I've tried many products similar to this, but this one is a keeper!
The company is doing well, and their stock is definitely a keeper.
See also
shopkeeper
storekeeper