autarch vs pharaoh

autarch

noun
  • A despotic ruler 

pharaoh

noun
  • The supreme ruler of Ancient Egypt; a formal address for the sovereign seat of power as personified by the "king" in an institutional role of Horus son of Osiris; often used by metonymy for Ancient Egyptian sovereignty 

  • The card game faro. 

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