fracture vs sunder

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. 

sunder

verb
  • To break or separate or to break apart, especially with force. 

  • To part, separate. 

noun
  • a separation into parts; a division or severance 

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