battle vs rivalry

battle

noun
  • A contest, a struggle. 

  • A general action, fight, or encounter, in which all the divisions of an army are or may be engaged; a combat, an engagement. 

  • battle buddy 

verb
  • To render (land, soil, etc.) fertile or fruitful. 

  • To feed or nourish (someone or something). 

  • To join in battle; to contend in fight 

  • To fight or struggle; to enter into a battle with. 

adj
  • Improving; nutritious; fattening. 

  • Fertile; fruitful. 

rivalry

noun
  • Any competition between two or more things or factors. 

  • The characteristic of being a rivalrous good, such that it can be consumed or used by only one person at a time. 

  • An ongoing relationship between (usually two) rivals who compete for superiority. 

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