bowstring vs cordage

bowstring

noun
  • The string of an archer's bow, as used by the Turks for strangling offenders. 

  • The string of an archer's bow. 

verb
  • To strangle with a bowstring. 

cordage

noun
  • A set of ropes and cords, especially that used for a ship's rigging. 

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