The Collaborative International Dictionary of English v.0.48:

chimneysweep \chimneysweep\, chimneysweeper \chimneysweeper\n.
   someone who cleans soot from chimneys, usually as a
   profession.

   Syn: chimneysweeper, sweep.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chimneysweeper
    n 1: someone who cleans soot from chimneys [syn:
         chimneysweeper, chimneysweep, sweep]