burgee vs pennon

burgee

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

pennon

noun
  • A long pointed streamer or flag on a vessel. 

  • A thin, often triangular flag or streamer, especially as hung from the end of a lance or spear. 

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