piazza vs town square

piazza

noun
  • A public square, especially in Italian cities. 

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

town square

noun
  • An open area commonly found in the heart of a traditional town, used for community gatherings. 

  • An online space or platform which serves a similar function. 

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