geepound vs projectile

geepound

noun
  • Synonym of slug (“unit of mass”) 

projectile

noun
  • an object intended to be or having been fired from a weapon. 

  • any object propelled through space by the application of a force. 

adj
  • Projecting or impelling forward. 

  • Caused or imparted by impulse or projection; impelled forward. 

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