coliseum vs fairground

coliseum

noun
  • A large, often circular building, for indoor sporting events, exhibitions, concerts, etc.; arena. 

  • A large theatre, cinema, or stadium. 

fairground

noun
  • An area where a fair (an event for public entertainment) or other public event is held; a showground. 

  • A commercially-operated collection of rides, games and other entertainment attractions; an amusement park. 

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