legislation vs supervision

legislation

noun
  • The act of legislating; preparation and enactment of laws. 

  • Law which has been enacted by legislature or other governing body 

supervision

noun
  • The act or instance of supervising. 

  • A tutorial session for an individual student or a small group. 

  • Responsible oversight. 

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