government vs mastery

government

noun
  • The tenure of a chief of state. 

  • The body with the power to make and/or enforce laws to control a country, land area, people or organization. 

  • The relationship between a word and its dependents. 

  • The state and its administration viewed as the ruling political power. 

  • The management or control of a system. 

mastery

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

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

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

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