dismount vs fracture

dismount

verb
  • To (cause to) get off (something). 

  • To come down; to descend. 

  • To throw (cannon) off their carriages. 

  • To make (a mounted drive) unavailable for use. 

noun
  • The part of a routine in which the gymnast detaches from an apparatus. 

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 dismount and fracture occurred in a corpus of books? (source: Google Ngram Viewer )