enervation vs stagnation

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

stagnation

noun
  • The state of being stagnant, without circulation. 

  • Inactivity. 

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