noun (n)

• a farm machine for separating seeds or grain from the husks and straw(noun.artifact)

  Synonym:
  thresher, threshing machine
  

  source: wordnet30
• thrush-like American songbird able to mimic other birdsongs(noun.animal)

  Synonym:
  mocking thrush
  

  source: wordnet30
• large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed(noun.animal)

  Synonym:
  alopius vulpinus, fox shark, thresher, thresher shark
  

  source: wordnet30
• One who, or that which, thrashes grain; a thrashing machine.(noun)

  source: webster1913