combat vs strife

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). 

strife

noun
  • Bitter conflict, sometimes violent. 

  • A trouble of any kind. 

  • Striving; earnest endeavor; hard work. 

  • Exertion or contention for superiority, either by physical or intellectual means. 

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