mock vs stand in

mock

noun
  • An imitation, usually of lesser quality. 

  • A practice exam set by an educating institution to prepare students for an important exam. 

  • A mockup or prototype; particularly, ellipsis of mock object., as used in unit testing. 

  • Mockery; the act of mocking. 

adj
  • Imitation, not genuine; fake. 

verb
  • To create a mockup or prototype of. 

  • To mimic, to simulate. 

  • To create an artistic representation of. 

  • To tantalise, and disappoint the hopes of. 

  • To make fun of, especially by mimicking; to taunt. 

stand in

noun
  • A substitute; a replacement. 

verb
  • To substitute for; to replace; (theater) to serve as an understudy. 

  • To make one of a party in a bet or other speculation. 

  • To take a side in a dispute. 

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