brass instrument vs slapper

brass instrument

noun
  • Any musical instrument whose tone is produced by vibration of the lips as the player blows into a mouthpiece (or tubular resonator). 

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 brass instrument and slapper occurred in a corpus of books? (source: Google Ngram Viewer )