proprietorship vs reign

proprietorship

noun
  • The state of being a proprietor; ownership 

reign

noun
  • The exercise of sovereign power. 

  • The territory or sphere over which a kingdom; empire; realm; dominion, etc. is ruled. 

  • The period during which a monarch rules. 

verb
  • To exercise sovereign power, to rule as a monarch. 

  • To reign over (a country) 

  • To be a dominant quality of a place or situation; to prevail, predominate, rule. 

  • To be the winner of the most recent iteration of a competition. 

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