bylaw vs rulership

bylaw

noun
  • A rule made by a local authority to regulate its own affairs. 

  • A law or rule governing the internal affairs of an organization (e.g., corporation or business). 

  • A local custom or law of a settlement or district. 

rulership

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

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