WordNet (r) 3.0 (2006):

stockpile
    n 1: something kept back or saved for future use or a special
         purpose [syn: reserve, backlog, stockpile]
    2: a storage pile accumulated for future use
    v 1: have on hand; "Do you carry kerosene heaters?" [syn:
         stock, carry, stockpile]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "stockpile":
   abundance, accumulate, accumulation, acervation, agglomerate,
   agglomeration, aggregate, aggregation, amass, amassment, backlog,
   bank, budget, cache, chunk, collect, collection, commissariat,
   commissary, congeries, conglobation, conglomerate, conglomeration,
   cornucopia, cumulate, cumulation, drift, dump, garner, garner up,
   gather into barns, gathering, glomeration, gob, heap, heap up,
   hide, hill, hive, hoard, hoard up, hold, hunk, inventory, keep,
   larder, lay up, lump, mass, material, materials, materiel, mound,
   mountain, munitions, nest egg, pile, pile up, plenitude, plenty,
   provisionment, provisions, put up, pyramid, rations, repertoire,
   repertory, reserve, reserve fund, reserve supply, reserves,
   reservoir, resource, rick, roll up, save, save up, savings,
   secrete, sinking fund, snowball, something in reserve, squirrel,
   squirrel away, stack, stock, stock up, stock-in-trade, store,
   store up, stores, supplies, supply on hand, treasure, treasure up,
   treasury, unexpended balance, wad