burgee vs guidon

burgee

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

guidon

noun
  • A small pennant or banner carried by infantry soldiers to direct troop movement. 

  • A soldier assigned to carry such a banner. 

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