explosion vs gunfire

explosion

noun
  • The sound of an explosion. 

  • A sudden outburst. 

  • A sudden uncontrolled increase. 

  • A violent release of energy (sometimes mechanical, nuclear, or chemical.) 

  • A bursting due to pressure. 

gunfire

noun
  • Shots from a gun or guns, typically creating loud report. 

  • The use of gunpowder-type weapons, mainly cannon, as opposed to swords or bayonets. 

  • The time of firing of the morning gun or the evening gun. 

  • Tea, a cup of tea, especially one served early in the morning before first parade. 

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