kingship vs sovereignhood

kingship

noun
  • The territory or dominion of a king; a kingdom. 

  • A monarchy. 

  • The dignity, rank or office of a king; the state of being a king. 

sovereignhood

noun
  • The state or condition of a sovereign; sovereignty. 

  • An independent or sovereign territory. 

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