boulevard vs esplanade

boulevard

noun
  • A broad, well-paved and landscaped thoroughfare. 

  • A strip of land between a street and sidewalk. 

  • The landscaping on the sides of a boulevard or other thoroughfare. 

esplanade

noun
  • 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. 

  • A grass plat; a lawn. 

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

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