appropriator

from WordNet (r) 3.0 (2006)

appropriator
    n 1: someone who takes for his or her own use (especially
         without permission)

from The Collaborative International Dictionary of English v.0.48

Appropriator \Ap*pro"pri*a`tor\, n.
   1. One who appropriates.
      [1913 Webster]

   2. (Law) A spiritual corporation possessed of an appropriated
      benefice; also, an impropriator.
      [1913 Webster]