discount store vs showroom

discount store

noun
  • A type of department store which sell products at prices lower than those asked by other department stores. 

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. 

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