guidon vs heraldry

guidon

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

  • A soldier assigned to carry such a banner. 

heraldry

noun
  • An armorial ensign along with its history and description. 

  • The profession or art of devising, granting and blazoning coats of arms, tracing genealogies and ruling on questions of protocol or rank. 

  • Pageantry. 

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