preparatory vs subsequent

preparatory

adj
  • Of or pertaining to preparation, having the purpose of making something or someone ready, preparative. 

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 preparatory and subsequent occurred in a corpus of books? (source: Google Ngram Viewer )