documentary vs film

documentary

noun
  • A film, TV program, publication etc. which presents a social, political, scientific or historical subject in a factual or informative manner. 

adj
  • Of, related to, or based on documents. 

  • Which serves to document (record and:or illustrate) a subject. 

  • Presented objectively without the insertion of fictional matter. 

film

noun
  • A visual art form that consists of a sequence of still images preserved on a recording medium to give the illusion of motion; movies generally. 

  • A medium used to capture images in a camera. 

  • A slender thread, such as that of a cobweb. 

  • A thin layer of some substance; a pellicle; a membranous covering, causing opacity. 

verb
  • To cover or become covered with a thin skin or pellicle. 

  • To visually record (activity, or a motion picture) in general, with or without sound. 

  • To record (activity, or a motion picture) on photographic film. 

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