Noun
plunger -
hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
plumber's helper
hand tool a tool used with workers' hands
plunger -
someone who risks losses for the possibility of considerable gains
speculator
adventurer ,
venturer a person who enjoys taking risks
gambler a person who wagers money on the outcome of games or sporting events
hedger a gardener who takes care of and trims hedges
operator an agent that operates some apparatus or machine; "the operator of the switchboard"
scalper someone who buys something and resells it at a price far above the initial cost; "he got theater tickets through a scalper"
plunger -
mechanical device that has a plunging or thrusting motion
piston
mechanical device mechanism consisting of a device that works on mechanical principles
reciprocating engine an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
piston ring seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
plunger -
someone who dives (into water)
diver
swimmer a person who travels through the water by swimming; "he is not a good swimmer"