continuative vs ephemeral

continuative

noun
  • Something that causes a continuation. 

  • a durative. 

adj
  • durative. 

  • Of or pertaining to continuation. 

ephemeral

noun
  • Something which lasts for a short period of time. 

adj
  • Usually dry, but filling with water for brief periods during and after precipitation. 

  • Lasting for a short period of time. 

  • Existing for only one day, as with some flowers, insects, and diseases. 

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