boards vs filmmaking

boards

noun
  • A stage (as in a theater). 

  • A hardcover binding on a book. 

  • Examinations given for entry to college or to qualify for a profession. 

  • Structure around a rink for ice hockey. 

filmmaking

noun
  • The manufacture of physical film. 

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

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