dud vs false alarm

dud

noun
  • A lottery ticket that does not give a payout. 

  • A failure of any kind. 

  • A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile. 

  • A loser; an unlucky person. 

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 dud and false alarm occurred in a corpus of books? (source: Google Ngram Viewer )