filmmaking vs seventh art

filmmaking

noun
  • The manufacture of physical film. 

  • The activity of preparing edited video works, formerly principally films, whether for entertainment or other purposes. 

seventh art

noun
  • Chiefly preceded by the: the art of making motion pictures; filmmaking. 

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