Hitler vs dictator

Hitler

noun
  • A dictatorial person; someone who loves to exert their power and influence over others. (often used as a term of abuse) 

name
  • A surname of Austrian origin. 

dictator

noun
  • A person who dictates text (e.g. letters to a clerk). 

  • A totalitarian leader of a country, nation, or government. 

  • A tyrannical boss or authority figure. 

  • A magistrate without colleague in republican Ancient Rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a war. 

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