misfire vs stillbirth

misfire

noun
  • An act of misfiring. 

verb
  • To fail to achieve the anticipated result. 

  • To fail to ignite in the proper sequence. 

  • To fail to discharge properly. 

stillbirth

noun
  • The birth of a dead fetus; the delivery of an infant which is dead at birth. 

  • The birth of a dead fetus after 20 weeks of gestation. 

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