combat vs cooperation

combat

noun
  • a struggle for victory 

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

verb
  • To fight; to struggle against. 

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

cooperation

noun
  • The act of cooperating. 

  • Association for mutual benefit, such as for purposes of production or purchase. 

  • Active help from a person, organization, etc., such as an orderly sharing of space or resources. 

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