corf vs fish trap

corf

noun
  • A container (basket, wooden box with holes etc.) used to store live fish underwater. 

  • A wooden frame, sled, or low-wheeled wagon, to convey coal or ore in the mines. 

  • A large basket, especially as used for coal. 

fish trap

noun
  • A contraption made of wires, rods, fishing-net or other suitable materials with the purpose of catching fish alive. 

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