mart vs piazza

mart

noun
  • A bazaar, fair, marketplace. 

  • A shop, store. 

  • Marque (chiefly used in the phrase letters of mart). 

  • Salt beef. 

  • A head of feeder cattle or fattened cattle (usually the latter). 

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 mart and piazza occurred in a corpus of books? (source: Google Ngram Viewer )