curvet vs somersault

curvet

verb
  • To fly or swim with darting movements. 

  • (of a person) To prance; to caper, frolic. 

  • Of a horse or, by extension, another animal: to leap about, to frolic. 

  • (of an object) To jump, skip, shake. 

  • To cause to leap about, dart or jump. 

noun
  • A prank; a frolic. 

  • A particular leap in which a horse raises both forelegs at once, equally advanced, and, as the forelegs are falling, raises the hind legs, so that all the legs are in the air at once. 

somersault

verb
  • To perform a 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. 

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