rock cocaine vs white horse

rock cocaine

noun
  • The off-white, crystal-like form of crack cocaine. 

white horse

noun
  • A recreational drug in the form of white powder: heroin or cocaine. 

  • A large mass of tough sinewy substance in the head of sperm whales, just above the upper jaw and extending in streaks into the junk above it. It resembles blubber, but contains no oil. 

  • Any of several horse-shaped chalk figures in England, such as the Uffington White Horse. 

  • Used other than figuratively or idiomatically: see white, horse. 

  • A wave that is blown by the wind such that its crest is broken up and appears white and foamy; a whitecap. 

How often have the words rock cocaine and white horse occurred in a corpus of books? (source: Google Ngram Viewer )