correspondence vs swap out

correspondence

noun
  • Reciprocal exchange of civilities, especially conversation between persons by means of letters. 

  • A relation. 

  • Postal or other written communications. 

  • An agreement of situations or objects with an expected outcome. 

  • Newspaper or news stories. 

  • A similarity between physical and spiritual things (e.g. light to wisdom, or warmth to love) 

swap out

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. 

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

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

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

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