downfall vs false alarm

downfall

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. 

verb
  • To fall down; deteriorate; decline. 

false alarm

noun
  • A warning signal (such as the call of sentry, the ringing of a bell, or the shriek of a siren) which turns out to have been given erroneously. 

  • A thing or occurrence which initially causes fear, distress, etc. but which is subsequently recognized as being no cause for concern. 

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