commutation vs correspondence

commutation

noun
  • Substitution of one thing for another; interchange. 

  • The reversal of an electric current. 

  • The change to a lesser penalty or punishment by the State 

  • Substitution, as a means of discriminating between phonemes. 

  • The process or habit of journeying to and from work on a regular basis; commuting. 

  • Specifically, the substitution of one kind of payment for another, especially a switch to monetary payment from obligations of labour. 

correspondence

noun
  • A relation. 

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

  • 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) 

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