dictatorship vs one-man rule

dictatorship

noun
  • Any household, institution, or other organization that is run under such sovereignty or autocracy. 

  • A government which exercises autocratic rule. 

  • A type of government where absolute sovereignty is allotted to an individual or a small clique. 

one-man rule

How often have the words dictatorship and one-man rule occurred in a corpus of books? (source: Google Ngram Viewer )