esplanade vs fourgon

esplanade

noun
  • A grass plat; a lawn. 

  • A clear space between a citadel and the nearest houses of the town. 

  • The glacis of the counterscarp, or the slope of the parapet of the covered way toward the country. 

  • Any clear, level space used for public walks or drives; especially, a terrace by the seaside. 

fourgon

noun
  • A polygon with four sides; a quadrilateral. 

  • A French baggage wagon. 

  • An ammunition wagon. 

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