cosh vs nightstick

cosh

noun
  • A weapon made of leather-covered metal similar to a blackjack. 

  • A blunt instrument such as a bludgeon or truncheon. 

verb
  • To strike with a weapon of this kind. 

adj
  • cosy; snug 

nightstick

noun
  • A long narrow pole-like club carried by police and security personnel, for use in self-defense. 

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