WordNet (r) 3.0 (2006):

boutique
    n 1: a shop that sells women's clothes and jewelry [syn:
         boutique, dress shop]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "boutique":
   chain store, co-op, concession, cooperative, countinghouse,
   country store, department store, dime store, discount house,
   discount store, emporium, establishment, five-and-ten,
   general store, house, magasin, mail-order house, market, mart,
   post, retail store, salon, shop, store, supermarket, trading post,
   variety shop, variety store, warehouse, wareroom,
   wholesale house