Raj vs rulership

Raj

noun

  • A system of government where authority is exercised by a specific group. 

name

  • A surname. 

  • The whole period of British influence or rule in the Indian subcontinent from the 1600s to 1947. 

  • A diminutive of the male given name Rajiv. 

  • A male given name. 

rulership

noun

  • A position in which one rules or has sovereignty over others. 

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