mastery vs superintendency

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. 

superintendency

noun
  • The condition of being a superintendent 

  • The act of superintending 

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