commutation vs seafaring

commutation

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

  • 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. 

  • Substitution of one thing for another; interchange. 

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

seafaring

noun
  • The act, process, or practice of travelling the seas 

  • The work, or calling of a sailor. 

adj
  • Living one's life at sea. 

  • Fit to travel on the sea; seagoing. 

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