crossbow vs singlestick

crossbow

noun
  • A mechanised weapon, based on the bow and arrow, that shoots bolts. 

  • A portable ballista that can be held in the hand. 

singlestick

noun
  • A one-handed wooden stick used for fencing in place of a sword. 

  • A martial art, sport or exercise using a cudgel or backsword. 

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