reciprocation vs swap out

reciprocation

noun
  • The act of reciprocating; interchange of acts; a mutual giving and returning 

  • Alternate recurrence or action; as, the reciprocation of the sea in the flow and ebb of tides; oscillation. 

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 reciprocation and swap out occurred in a corpus of books? (source: Google Ngram Viewer )