autarchy vs sovereignhood

autarchy

noun
  • Sovereignty or self-government (national political independence). 

  • A condition of absolute power. 

  • Autocracy (absolute rule by a single person). 

sovereignhood

noun
  • An independent or sovereign territory. 

  • The state or condition of a sovereign; sovereignty. 

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