loan shark vs moneylender

loan shark and moneylender both are nouns.

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

As nouns, loan shark and moneylender are synonyms defined as:

loan shark and moneylender: someone who lends money at excessive rates of interest

Other synonyms of loan shark include shylock, usurer.

loan shark (noun)	moneylender (noun)
someone who lends money at excessive rates of interest	someone who lends money at excessive rates of interest