ascendancy vs tyranny

ascendancy

noun
  • Supremacy; dominant control; the quality of being in the ascendant. 

  • A class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century 

  • A quantitative attribute of an ecosystem, defined as a function of the ecosystem's trophic network, and intended to indicate its ability to prevail against disturbance by virtue of its combined organization and size. 

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 ascendancy and tyranny occurred in a corpus of books? (source: Google Ngram Viewer )