The Collaborative International Dictionary of English v.0.48:

Florist \Flo"rist\ (? or ?; 277), n. [Cf. F. fleuriste,
   floriste, fr. F. fleur flower. See Flower.]
   1. A cultivator of, or dealer in, flowers.
      [1913 Webster]

   2. One who writes a flora, or an account of plants.
      [1913 Webster]

WordNet (r) 3.0 (2006):

florist
    n 1: someone who grows and deals in flowers; "the florist made
         up an attractive bouquet"
    2: a shop where flowers and ornamental plants are sold [syn:
       florist, florist shop, flower store]

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "florist":
   antique store, apothecary, automobile showroom, baker, bookdealer,
   bookseller, bookstore, bootery, butcher, candy store, chandler,
   chemist, cigar store, clothiers, clothing merchant, clothing store,
   confectioner, confectionery, draper, dress shop, drugstore,
   dry goods store, drysalter, fishmonger, fishwife, floriculturist,
   florists, footwear merchant, fruit-grower, fruiterer, fur salon,
   furnisher, furniture store, furrier, gardener, gift shop,
   greengrocer, grocer, groceryman, haberdasher, haberdashery,
   hardware store, hardwareman, hat shop, hobby shop, horticulturist,
   ironmonger, ironmongery, jeweler, jewelers, jewelry store,
   landscape architect, landscape gardener, landscapist,
   leather goods store, liquor merchant, liquor store, luggage shop,
   market gardener, milliners, newsdealer, novelty shop, nurseryman,
   olericulturist, orchardist, orchardman, package store, perfumer,
   pharmacy, poulterer, saddler, saddlery, schlock house,
   schlock shop, secondhand shop, secondhand store, shoe store,
   smoke shop, specialty shop, sporting goods store, stationer,
   stationers, stationery store, sweater shop, sweet shop,
   thrift shop, tobacco store, tobacconist, tobacconists, toy shop,
   trimming store, truck gardener, used-car lot, vigneron, vinegrower,
   viniculturist, vintager, vintner, viticulturist, wine merchant