department store vs showroom

department store

noun
  • A large store containing many different departments, each of which deals in the sale of different goods or services. 

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 department store and showroom occurred in a corpus of books? (source: Google Ngram Viewer )