cinema vs photoplay

cinema

noun
  • A movie theatre, a movie house 

  • Films collectively. 

  • The art of making films and movies; cinematography 

  • The film and movie industry. 

photoplay

noun
  • A theatrical play that has been filmed for showing as a movie. 

  • A novel adapted from a movie and illustrated with photographic stills taken from the film. Usage largely confined to the silent era of Hollywood. 

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