lathi vs nightstick

lathi

noun
  • A heavy stick or club, usually used by policemen. 

  • A martial art based on stick fighting originally practiced in India. 

nightstick

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

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