capability vs mastery

capability

noun
  • the power or ability to generate an outcome 

  • A digital token allowing a user or process to interact in a specified way with an object that is subject to access control. 

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. 

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