burgee vs gonfalon

burgee

noun
  • A flag, usually a broad tapering pennant, often with a swallowtail, flown by yachts to identify the owner's yacht club. 

gonfalon

noun
  • A standard or ensign, consisting of a pole with a crosspiece from which a banner is suspended, especially as used in church processions, but also for civic and military display. 

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