The Collaborative International Dictionary of English v.0.48:

drugstore \drugstore\ n.
   a retail shop where medicine and other articles are sold.

   Syn: apothecary's shop, chemist's, chemist's shop,
        dispensary, pharmacy.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

chemist's \chemist's\ n.
   a retail shop where medicine and other articles are sold; a
   drugstore. [British]

   Syn: drugstore, apothecary's shop, chemist's shop,
        dispensary, pharmacy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

drugstore
    n 1: a retail shop where medicine and other articles are sold
         [syn: drugstore, apothecary's shop, chemist's,
         chemist's shop, pharmacy]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "drugstore":
   antique store, apothecary, automobile showroom, bookstore, bootery,
   candy store, chemist, cigar store, clothiers, clothing store,
   confectionery, dispensary, dispensatory, dress shop,
   dry goods store, florists, fur salon, furniture store, gift shop,
   haberdashery, hardware store, hat shop, hobby shop, ironmongery,
   jewelers, jewelry store, leather goods store, liquor store,
   luggage shop, milliners, novelty shop, package store, pharmacy,
   saddlery, schlock house, schlock shop, secondhand shop,
   secondhand store, shoe store, smoke shop, specialty shop,
   sporting goods store, stationers, stationery store, sweater shop,
   sweet shop, thrift shop, tobacco store, tobacconists, toy shop,
   trimming store, used-car lot