whizzer

noun4

1. •
   A set of horizontal blades used to separate mineral particles.
2. •
   A device used in milling to dry wheat, etc. by rapid spinning.
3. •
   (UK, slang) A pickpocket.

   • They were whizzers (pickpockets) but they would also take part in burglaries. — 1981
4. •
   (historical) Synonym of whizgig (“spinning toy”).