black jack vs truncheon

black jack

noun
  • Sphalerite. 

  • Caranx lugubris, a gamefish 

  • Bidens spp., from the family of Asteraceae 

truncheon

noun
  • A penis. 

  • A short staff, a club; a cudgel. 

  • A baton, or military staff of command, now especially the stick carried by a police officer. 

verb
  • To strike with a truncheon. 

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