mastery vs overwin

mastery

noun
  • Superiority in war or competition; victory; triumph; preeminence. 

  • The position or authority of a master; dominion; command; supremacy; superiority. 

  • The act or process of mastering; the state of having mastered; expertise. 

overwin

noun
  • The win or winning of a game. 

verb
  • To overcome; gain one's point; exceed. 

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