fracture vs severance

fracture

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

  • A break in bone or cartilage. 

  • A fault or crack in a rock. 

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

  • To break, or cause something to break. 

severance

noun
  • The act of severing or the state of being severed. 

  • A separation. 

  • A severance payment. 

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