arcade vs piazza

arcade

noun
  • A covered passage, usually with shops on both sides. 

  • An establishment that runs coin-operated games. 

  • A row of arches. 

verb
  • To cover (something) as with a series of arches. 

piazza

noun
  • A roofed gallery or arcade (for example around a public square or in front of a building). 

  • A public square, especially in Italian cities. 

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