authority vs tyranny

authority

noun
  • Official permission; authorisation to act in some capacity on behalf of a ruling entity. 

  • A reliable, definitive source of information on a subject. 

  • Persons, regarded collectively, who occupy official positions of power; police or law enforcement. 

  • A government-owned agency that runs a revenue-generating activity for public benefit. 

  • Status as a trustworthy source of information, reputation for mastery or expertise; or claim to such status or reputation. 

  • Power or right to make or enforce rules or give orders; or a position having such power or right. 

tyranny

noun
  • The office or jurisdiction of an absolute ruler. 

  • A government in which a single ruler (a tyrant) has absolute power; this system of government. 

  • Extreme severity or rigour. 

  • Absolute power, or its use. 

  • A system of government in which power is exercised on behalf of the ruler or ruling class, without regard to the wishes of the governed. 

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