boathook vs leister

boathook

noun
  • A pole or rod with such a hook at one end. 

  • A hook attached to a pole used for pulling or pushing boats, rafts, logs or other objects to or from the side of a boat. 

leister

noun
  • A spear armed with three or more barbed prongs for catching fish, particularly salmon. 

verb
  • To catch or spear (fish) with a leister. 

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