billhook vs tusker

billhook

noun
  • An agricultural implement often with a curved or hooked end to the blade used for pruning or cutting thick, woody plants. 

  • Written as bill hook: a sharply pointed spike growing from the tip of the upper mandible of the hatchlings of honeyguides, used to destroy the eggs and kill the chicks of the host species. 

  • Written as bill-hook: a part of the knotting mechanism in a reaper-binder or baler (agricultural machinery). 

  • Written as bill hook: a spiked hook used in offices and shops for hanging bills or other small papers such as receipts. 

  • A medieval polearm, fitted to a long handle, sometimes with an L-shaped tine or a spike protruding from the side or the end of the blade for tackling the opponent; a bill 

verb
  • To use a billhook 

tusker

noun
  • A tool used in peat cutting, a type of spade similar to a cascrom. 

  • An animal, such as a bull elephant or a boar, with large tusks. 

How often have the words billhook and tusker occurred in a corpus of books? (source: Google Ngram Viewer )