photoplay vs silver screen

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. 

silver screen

noun
  • A cinema screen onto which movies are projected. 

  • By extension, movies, or that which is related to movies or cinema. 

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