contest vs struggle

contest

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

  • To call into question; to oppose. 

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

  • To contend. 

noun
  • Controversy; debate. 

  • Struggle for superiority; combat. 

  • A competition. 

struggle

verb
  • To strive, to labour in difficulty, to fight (for or against), to contend. 

  • To strive, or to make efforts, with a twisting, or with contortions of the body. 

noun
  • A contortion of the body in an attempt to escape or to perform a difficult task. 

  • Strife, contention, great effort. 

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