splitter

from WordNet (r) 3.0 (2006)

splitter
    n 1: a worker who splits fish and removes the backbone
    2: a taxonomist who classifies organisms into many groups on the
       basis of relatively minor characteristics [syn: {splitter},
       {divider}] [ant: {lumper}]
    3: a laborer who splits logs to build split-rail fences [syn:
       {rail-splitter}, {splitter}]

from The Collaborative International Dictionary of English v.0.48

Splitter \Split"ter\ (-t[~e]r), n.
   One who, or that which, splits.
   [1913 Webster]