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]