oppidan vs populace

oppidan

adj
  • Of or pertaining to a town or conurbation. 

noun
  • A class of student in traditional English public schools such as Eton; opposed to colleger or King's Scholar. 

populace

noun
  • The inhabitants of a nation. 

  • The common people of a nation. 

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