documentary vs videotape

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. 

videotape

noun
  • A relatively wide magnetic tape used for recording visual images and sounds (as of a television production) for subsequent playback or broadcasting. 

verb
  • to make a recording of something on videotape 

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

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