Magdalen vs slapper

Magdalen

name
  • A female given name from Hebrew, variant of Magdalene 

slapper

noun
  • 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. 

  • A prostitute. 

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