leadership vs regime

leadership

noun
  • The office or status of a leader. 

  • The capacity of someone to lead others. 

  • A group of leaders. 

regime

noun
  • A form of government, or the government in power. 

  • A division of a Mafia crime family, led by a caporegime. 

  • A set of characteristics. 

  • A period of rule. 

  • Mode of rule or management. 

  • A regulated system; a regimen. 

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