Shark
WordNet
noun
(1) Any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
(2) A person who is unusually skilled in certain ways
"A card shark"
(3) A person who is ruthless and greedy and dishonest
verb
(4) Hunt shark
(5) Play the shark; act with trickery