WordNet (r) 3.0 (2006):

stock room
    n 1: storeroom for storing goods and supplies used in a business
         [syn: stockroom, stock room]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "stock room":
   archives, armory, arsenal, attic, bank, basement, bay, bin,
   bonded warehouse, bookcase, box, bunker, buttery, cargo dock,
   cellar, chest, closet, conservatory, crate, crib, cupboard,
   depository, depot, dock, drawer, dump, exchequer, glory hole,
   godown, hold, hutch, library, locker, lumber room, lumberyard,
   magasin, magazine, rack, repertory, repository, reservoir, rick,
   shelf, stack, stack room, storage, store, storehouse, storeroom,
   supply base, supply depot, tank, treasure house, treasure room,
   treasury, vat, vault, warehouse, wine cellar