combat vs fighting

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). 

fighting

noun
  • A fight or battle; an occasion on which people fight 

  • The act or process of contending; violence or conflict. 

adj
  • Engaged in war or other conflict. 

  • Apt to provoke a fight. 

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