esplanade vs public walk

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. 

public walk

noun
  • A promenade or well-frequented pedestrian way in a town. 

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