shark vs loan shark

shark and loan shark both are nouns.

Word	Noun	Adjective	Verb	Adverb
shark	Yes	No	Yes	No
loan shark	Yes	No	No	No

As nouns, loan shark is a hyponym of shark; that is, loan shark is a word with a more specific, narrower meaning than shark:

Other hyponyms of shark include moneylender, shylock, usurer.

shark (noun)	loan shark (noun)
any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales	someone who lends money at excessive rates of interest
a person who is unusually skilled in certain ways
a person who is ruthless and greedy and dishonest

shark (verb)	loan shark (verb)
hunt shark
play the shark; act with trickery