Part of speech: Noun
someone who dives (into water)
Part of speech: Noun
someone who risks losses for the possibility of considerable gains
Part of speech: Noun
mechanical device that has a plunging or thrusting motion
Part of speech: Noun
hand tool consisting of a stick with a rubber suction cup at one end
Example: used to clean clogged drains
Piston, Speculator, Diver, Plunger, Plumber's helper