esplanade vs plaza

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. 

plaza

noun
  • A town's public square. 

  • A shopping mall. 

  • A strip mall. 

  • An open area used for gathering in a city, often having small trees and sitting benches. 

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