pay vs swap out

pay

verb
  • To give money or other compensation to in exchange for goods or services. 

  • To discharge an obligation or debt. 

  • To cover (the bottom of a vessel, a seam, a spar, etc.) with tar or pitch, or a waterproof composition of tallow, resin, etc.; to smear. 

  • To be profitable or worth the effort. 

  • To admit that a joke, punchline, etc., was funny. 

  • To suffer consequences. 

  • To discharge, as a debt or other obligation, by giving or doing what is due or required. 

  • To be profitable for. 

  • To give (something else than money). 

adj
  • Operable or accessible on deposit of coins. 

  • Pertaining to or requiring payment. 

noun
  • Money given in return for work; salary or wages. 

swap out

verb
  • To exchange (something or someone) for an unused (or less-used) equivalent. 

  • To exchange (something) for (something else). (usually followed by with or for) 

  • To transfer (memory contents) into a swap file. 

noun
  • Anything that is swapped out for another; an exchange. 

  • A pre-prepared food item used in place of an unfinished food item in order to cut down the overall preparation time during filming. 

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