nunchaku vs smallsword

nunchaku

noun
  • The skill of using this weapon in martial arts. 

  • A weapon originating from Okinawa, Japan, consisting of two sticks joined by a chain or cord. 

smallsword

noun
  • A light one-handed sword, designed for thrusting, which evolved out of the longer and heavier rapier of the late Renaissance. 

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