fracture vs harrow

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. 

harrow

verb
  • To break or tear, as if with a harrow; to wound; to lacerate; to torment or distress; to vex. 

  • To traumatize or disturb; to frighten or torment. 

  • To drag a harrow over; to break up with a harrow. 

noun
  • An obstacle formed by turning an ordinary harrow upside down, the frame being buried. 

  • A device consisting of a heavy framework having several disks or teeth in a row, which is dragged across ploughed land to smooth or break up the soil, to remove weeds or cover seeds; a harrow plow. 

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