stockpile

nouns

something kept back or saved for future use or a special purpose
backlog, reserve, stockpile
a storage pile accumulated for future use
stockpile
is a type of (narrower)
a collection of objects laid on top of each other
agglomerate, cumulation, cumulus, heap, mound, pile

verbs

have on hand
"Do you carry kerosene heaters?"
carry, stock, stockpile
is derived from
stockpiling