moll vs slapper

moll

noun
  • A prostitute or woman with loose sexual morals. 

  • A girlfriend of a surfie; blends with pejorative sense. 

  • A female fan of extreme metal, grunge or hardcore punk, especially the girlfriend of a musician of those aforementioned genres. 

  • A girlfriend of a bikie. 

  • A female companion of a gangster, especially a former or current prostitute. 

  • Bitch, slut; an insulting epithet applied to a female. 

slapper

noun
  • A prostitute. 

  • A type of detonator which uses a powerful surge of electricity to vaporize a thin metal foil, propelling a larger piece of plastic film at a speed high enough to detonate an explosive upon impact. 

  • One who, or that which, slaps. 

  • A woman of loose morals. 

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