debilitation vs enervation

debilitation

noun
  • The act or process of debilitating, or the condition of one who is debilitated; weakness. 

enervation

noun
  • Act of enervating; debilitation. 

  • State of being enervated; debility. 

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