Shark (Noun)

A person who is unusually skilled in certain ways; "a card shark".

Nouns denoting people.

She was a pool shark, able to make impossible shots with ease.
He was a chess shark, beating even the most experienced opponents.
The young programmer was a coding shark, able to write complex algorithms in no time.
The real estate agent was a negotiation shark, always getting the best deals for her clients.
The lawyer was a courtroom shark, known for his aggressive and effective tactics.

A person who is ruthless and greedy and dishonest.

Nouns denoting people.

The businessman was known as a shark for his aggressive and exploitative tactics in the corporate world.
He was a shark who preyed on vulnerable investors, selling them fake stocks and bonds.
The politician was accused of being a shark, using her power to line her own pockets with taxpayer money.
The lawyer was a shark who would stop at nothing to win a case, even if it meant bending the truth.
The real estate agent was a shark who would sell a house to anyone, regardless of its condition, as long as he got his commission.

Any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales.

Nouns denoting animals.

The divers saw a large shark approaching the boat.
In Australia, certain beaches have nets to prevent shark attacks on swimmers.
She has a deep-seated fear of being eaten by a shark.
Experts studied the migratory patterns of great white shark in the ocean.
Scuba diving enthusiasts eagerly signed up for a trip to spot the hammerhead shark in the Maldives.