blunder vs false alarm

blunder

noun
  • A clumsy or embarrassing mistake. 

  • A very bad move, usually caused by some tactical oversight. 

verb
  • To make a clumsy or stupid mistake. 

  • To do or treat in a blundering manner; to confuse. 

  • To move blindly or clumsily. 

  • To cause to make a mistake. 

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