usurer vs loan shark

usurer and loan shark both are nouns.

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

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

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

Other synonyms of usurer include moneylender, shylock.

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