autocratic vs dictatorial

autocratic

adj
  • Of or pertaining to the manner of an autocrat. 

  • Of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government. 

dictatorial

adj
  • of or pertaining to a dictator 

  • in the manner of a dictator, usually with callous disregard for others. 

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