chief minister vs dictator

chief minister

noun
  • The leader of government in many semi-autonomous and constituent federal states. 

dictator

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

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

  • 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 chief minister and dictator occurred in a corpus of books? (source: Google Ngram Viewer )