blunder vs spontaneous abortion

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. 

spontaneous abortion

noun
  • A miscarriage. 

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