diner vs shopper

diner

noun
  • A typically small restaurant, usually modeled after a railroad dining car, that serves lower-class fare, normally having a counter with stools along one side and booths on the other, and often decorated in 50s and 60s pop culture themes and playing popular music from those decades. 

  • One who dines. 

  • A dining car in a railroad train. 

shopper

noun
  • A kind of bicycle suited to riding short distances. 

  • A person who shops. 

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

  • A plastic shopping bag. 

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