Noun

• S: (n) speculator, plunger (someone who risks losses for the possibility of considerable gains)
• S: (n) diver, plunger (someone who dives (into water))
• S: (n) plunger, plumber's helper (hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains)
• S: (n) piston, plunger (mechanical device that has a plunging or thrusting motion)