propeller

noun

1. One who, or that which, propels.
2. A mechanical device with evenly-shaped blades that turn on a shaft to push against air or water, especially one used to propel an aircraft or boat.

   “The plane’s propeller spun rapidly before takeoff.”

   “The boat is powered by a single propeller.”

   “He repaired the damaged propeller after the storm.”

   “"No motor," Tranny says. "It snag bad." Right. The spiderweb would get wrapped around the propeller.”

3. A steamboat thus propelled; a screw steamer.
4. A spinnerbait.