film industry vs photoplay

film industry

noun
  • The technological and commercial institutions of filmmaking. 

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 film industry and photoplay occurred in a corpus of books? (source: Google Ngram Viewer )