ex vs subsequent

ex

verb
  • To delete; to cross out 

noun
  • A former partner or spouse, usually short for ex-girlfriend, ex-boyfriend, ex-wife or ex-husband. 

  • The name of the Latin-script letter X. 

adj
  • expensive, dear 

  • Ex-, former, previously but no longer. 

  • the place the train originated from or called at prior to the present location. 

subsequent

noun
  • A subsequent stream or faultline. 

adj
  • Following in order of place; succeeding. 

  • Following a line in the earth that is more easily eroded. 

  • Following in time; coming or being after something else at any time, indefinitely. 

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