celluloid vs motion picture

celluloid

noun
  • The genre of cinema; film. 

  • Any of a variety of thermoplastics created from nitrocellulose and camphor, once used as photographic film. 

motion picture

noun
  • A movie. 

  • A sequence of images depicting people or objects in motion, preserved on a recording medium and capable of being projected for viewing. 

name
  • a sequence of images that cause the illusion of motion 

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