empress vs pharaoh

empress

noun
  • The female monarch (ruler) of an empire. 

  • The third trump or major arcana card of most tarot decks. 

  • A female chimpanzee. 

  • A deciduous tree, Paulownia tomentosa 

  • The wife or widow of an emperor or equated 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 empress and pharaoh occurred in a corpus of books? (source: Google Ngram Viewer )