slavery vs tyranny

slavery

noun
  • An institution or social practice of owning human beings as property, especially for use as forced laborers. 

  • A condition of servitude endured by a slave. 

  • A condition in which one is captivated or subjugated, as by greed or drugs. 

  • Forced labor in general, regardless of legality. 

adj
  • Covered in slaver; slobbery. 

tyranny

noun
  • 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. 

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

  • The office or jurisdiction of an absolute ruler. 

  • Extreme severity or rigour. 

  • Absolute power, or its use. 

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