firebomb vs projectile

firebomb

noun
  • A weapon that causes fire; an incendiary weapon. 

verb
  • To attack with a firebomb. 

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 firebomb and projectile occurred in a corpus of books? (source: Google Ngram Viewer )