presidency vs sovereignship

presidency

noun
  • The office or role of president. 

  • A supreme local council made up of three persons; (usually capitalized; also First Presidency) the highest authority. 

  • The bureaucratic organization and governmental initiatives devolving directly from the president. 

  • The time during which one is president; a president's term of office. 

  • One of the three original provinces of British India. 

  • The role of ordained clergy in the celebration of the Eucharist in some denominations. 

sovereignship

noun
  • The role or status of sovereign. 

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