feature film vs motion picture

feature film

noun
  • The main, full-length film in a cinema program that also included a short film and often a newsreel. As of now, it plays after the trailers. 

  • Any film produced to be shown in cinemas before being released for home viewing. 

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 feature film and motion picture occurred in a corpus of books? (source: Google Ngram Viewer )