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1. Someone who risks losses for the possibility of considerable gains
   - speculator
    
2. Someone who dives (into water)
   - diver
    
3. Hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
   - plumber's helper [N. Amer], plumber's friend
    
4. Mechanical device that has a plunging or thrusting motion
   - piston

Derived forms: plungers

Type of: adventurer, gambler, hand tool, mechanical device, swimmer, venturer

Part of: reciprocating engine

Encyclopedia: Plunger