hurtle vs somersault

hurtle

noun
  • A fast movement in literal or figurative sense. 

  • A clattering sound. 

verb
  • To hurl or fling; to throw hard or violently. 

  • To move rapidly, violently, or without control. 

somersault

noun
  • Starting on one's feet, an instance of rotating one's body 360 degree while airborne or on the ground, with one's feet passing over one's head. 

verb
  • To perform a somersault. 

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