combat vs shootout

combat

noun
  • A battle, a fight (often one in which weapons are used). 

  • a struggle for victory 

verb
  • To fight; to struggle against. 

  • To fight (with); to struggle for victory (against). 

shootout

noun
  • A decisive battle, especially a gunfight. 

  • A series of penalty shots during which a tied game is resolved. 

  • A multitable poker tournament in which only the last player on a table goes on to the next. 

  • A match in which both teams score highly. 

  • A penalty shootout. 

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