atrophy vs downfall

atrophy

verb
  • To cause to waste away or become abortive; to starve or weaken. 

  • To wither or waste away. 

noun
  • A reduction in the functionality of an organ caused by disease, injury or lack of use. 

downfall

verb
  • To fall down; deteriorate; decline. 

noun
  • The cause of such a fall; a critical blow or error. 

  • A precipitous decline in fortune; death or rapid deterioration, as in status or wealth. 

  • An act of falling down. 

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