burn out vs fracture

burn out

verb
  • To cause (someone) to tire due to overwork; to cause (someone) to overwork to one's limit. 

  • To end one's shift at a job. 

  • To have one's tires skid against the ground; to peel off, peel out. 

  • To destroy by fire. 

  • To make (someone) unavailable for work involving exposure to ionizing radiation by employing (the person) in such work until the person's accumulated exposure reaches the maximum permitted for an administrative period, typically a year. 

  • To tire due to overwork; to overwork to their limit. 

  • To become extinguished due to lack of fuel. 

  • To become nonfunctional (especially of lightbulbs or similar light-producing devices). 

noun
  • (of a person) The condition of tiredness due to overwork. 

fracture

verb
  • To break, or cause something to break. 

  • To amuse (a person) greatly; to split someone's sides. 

noun
  • A break in bone or cartilage. 

  • An instance of breaking, a place where something has broken. 

  • A fault or crack in a rock. 

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