escutcheon vs lieutenant junior grade

escutcheon

noun
  • An individual or corporate coat of arms. 

  • A small shield used to charge a larger one. 

  • The insignia around a doorknob's exterior hardware or a door lock's cosmetic plate. 

  • The part of a ship's stern where its name is displayed. 

  • A marking upon the back of a cow's udder and the space above it (the perineum), formed by the hair growing upward or outward instead of downward. It was once taken as an index of milking qualities. 

  • A decorative and/or protective plate or bezel to fill the gap between a switch, pipe, valve, control knob, etc., and the surface from which it protrudes. 

  • The pattern of distribution of hair upon the pubic mound. 

  • The depression behind the beak of certain bivalves; the ligamental area. 

lieutenant junior grade

noun
  • A commissioned officer of the United States Navy whose rank is above an ensign's and below a lieutenant, or a corresponding rank in other navies. 

  • A commissioned officer in the United States Coast Guard, Public Health Service, or National Atmospheric and Oceanic Administration whose rank is above an ensign and below a lieutenant. 

How often have the words escutcheon and lieutenant junior grade occurred in a corpus of books? (source: Google Ngram Viewer )