contest vs litigate

contest

verb
  • To make a subject of litigation; to defend, as a suit; to dispute or resist, as a claim, by course of law. 

  • To strive earnestly to hold or maintain; to struggle to defend. 

  • To call into question; to oppose. 

  • To contend. 

noun
  • Controversy; debate. 

  • Struggle for superiority; combat. 

  • A competition. 

litigate

verb
  • To go to law; to carry on a lawsuit. 

  • To dispute; to fight over. 

  • To contest in law. 

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