showroom vs stock exchange

showroom

noun
  • A room in a business set aside for the display of the company's products. 

verb
  • To inspect merchandise in a physical store, then purchase the identical product from an online merchant; to use a physical store as a showroom for an online merchant. 

stock exchange

noun
  • A building that trades stocks in of companies for money and vice versa. 

  • An organisation that trades stocks in of companies for money and vice versa. 

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