cotton wool vs shag

cotton wool

noun
  • Soft, absorbent cotton for medical or cosmetic use, protective padding, etc. 

  • Raw fibers of cotton before being processed. 

shag

noun
  • Matted material; rough massed hair, fibres etc. 

  • A type of rough carpet pile. 

  • A deliberately messy, shaggy hairstyle. 

  • An act of sexual intercourse. 

  • Coarse shredded tobacco. 

  • Any of several species of sea birds in the family Phalacrocoracidae (cormorant family), especially the common shag or European shag, Phalacrocorax aristotelis, found on European and African coasts. 

  • A fundraising dance in honour of a couple engaged to be married. 

  • A casual sexual partner. 

  • Friend; mate; buddy. 

  • A swing dance. 

verb
  • To have sexual intercourse with. 

  • To perform the dance called the shag. 

  • To make hairy or shaggy; to roughen. 

  • To shake, wiggle around. 

  • To chase after; especially, to chase after and return (a ball) hit usually out of play. 

  • To have sexual intercourse. 

  • To masturbate. 

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