Chopper

• vane

  Flat surface that rotates and pushes against air or water.

• rotor

  Rotating mechanism consisting of an assembly of rotating airfoils; "there are horizontal rotors...

Also contains

• shaft

  A revolving rod that transmits power or motion.

• bearing

  A rotating support placed between moving parts to allow them to move easily.

• circle

  Any circular or rotating mechanism; "the machine punched out metal circles".

• cam

  A rotating disk shaped to convert circular into linear motion.

• Ferris wheel

  A vertical rotating mechanism consisting of a large wheel with suspended seats that...

• gyroscope

  Rotating mechanism in the form of a universally mounted spinning wheel that offers resistance...