flea market vs mart

flea market

noun
  • An outdoor temporary market selling inexpensive antiques, curios etc. 

  • A permanent indoor market of stalls in a warehouse selling inexpensive antiques, outdated goods, curios, etc. 

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). 

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