stealer

from WordNet (r) 3.0 (2006)

stealer
    n 1: a criminal who takes property belonging to someone else
         with the intention of keeping it or selling it [syn:
         {thief}, {stealer}]

from The Collaborative International Dictionary of English v.0.48

Stealer \Steal"er\ (-[~e]r), n.
   1. One who steals; a thief.
      [1913 Webster]

   2. (Shipbuilding) The endmost plank of a strake which stops
      short of the stem or stern.
      [1913 Webster]