noun (n)

• a worker who splits fish and removes the backbone(noun.person)

  source: wordnet30
• a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics(noun.person)

  Synonym:
  divider
  Antonym:
  lumper
  

  source: wordnet30
• a laborer who splits logs to build split-rail fences(noun.person)

  Synonym:
  rail-splitter
  

  source: wordnet30
• One who, or that which, splits.(noun)

  source: webster1913