bombing vs combat

bombing

noun
  • The action of placing and detonating bombs. 

  • The action of dropping bombs from the air. 

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). 

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