cartwheel vs silver dollar

cartwheel

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. 

verb
  • To perform the gymnastics feat of a cartwheel. 

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

silver dollar

noun
  • A dollar coin, whether made from silver or not. 

  • A small pancake. 

  • Several species of tropical freshwater fish of the genus Metynnis, of the family Characidae or Serrasalmidae, of which Metynnis argenteus is one; popular for aquariums; so named from their shape and flashing silver color. 

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