cash register vs checkout

cash register

noun
  • A point of sale. 

  • A machine that tabulates the amount of sales transactions, makes a permanent and cumulative record of them, and has a drawer in which cash can be kept. 

checkout

noun
  • The place in a supermarket where this is done. 

  • The process of checking out items at a supermarket or library. 

  • A test to see if some device is functioning properly. 

  • The process of confirming and paying for an online purchase. 

  • The process of checking out of a hotel, or the latest time to vacate a room in one. 

  • The number of points that a player scores on their final, winning visit to the oche. 

  • An inspection or investigation. 

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