cartwheel vs somersault

cartwheel

verb
  • To perform the gymnastics feat of a cartwheel. 

  • To flip end over end: normally said of a crashing vehicle or aircraft. 

noun
  • The literal wheel of a cart. 

  • A gymnastic maneuver whereby the gymnast rotates to one side or the other while keeping arms and legs outstretched, spinning for one or more revolutions. 

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 cartwheel and somersault occurred in a corpus of books? (source: Google Ngram Viewer )