explosion vs salvo

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. 

salvo

noun
  • A concentrated fire from pieces of artillery, as in endeavoring to make a break in a fortification; a volley. 

  • A salute paid by a simultaneous, or nearly simultaneous, firing of a number of cannon. 

  • An exception; a reservation; an excuse. 

  • Any volley, as in an argument or debate. 

  • The combined cheers of a crowd. 

verb
  • To discharge weapons in a salvo. 

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