ensign vs heraldry

ensign

noun
  • A flag or banner carried by military units; a standard or color/colour. 

  • A junior commissioned officer in the 18th and 19th centuries whose duty was to carry the unit's ensign. 

  • The lowest grade of commissioned officer in the United States Navy, junior to a lieutenant junior grade. 

  • A badge of office, rank, or power. 

  • The principal flag or banner flown by a ship (usually at the stern) to indicate nationality. 

  • Any prominent flag or banner. 

verb
  • To distinguish by a mark or ornament. 

  • To distinguish by an ornament, especially by a crown. 

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 ensign and heraldry occurred in a corpus of books? (source: Google Ngram Viewer )