shopper vs window-shopper

shopper

noun
  • A person who shops. 

  • A kind of bicycle suited to riding short distances. 

  • A free local newspaper containing advertisements for local shops etc; sometimes includes discount coupons. 

  • A plastic shopping bag. 

window-shopper

noun
  • A person who window-shops. 

How often have the words shopper and window-shopper occurred in a corpus of books? (source: Google Ngram Viewer )