Source : Webster's Revised Unabridged Dictionary (1913)

Decorator \Dec"o*ra`tor\, n. [Cf. F. d['e]corateur.]
   One who decorates, adorns, or embellishes; specifically, an
   artisan whose business is the decoration of houses, esp.
   their interior decoration.

Source : WordNet®

decorator
     n 1: a person who specializes in designing architectural
          interiors and their furnishings [syn: {interior designer},
           {designer}, {interior decorator}, {house decorator}, {room
          decorator}]
     2: someone who decorates [syn: {ornamentalist}]