credit exposure vs sum of money

credit exposure and sum of money both are nouns.

Word	Noun	Adjective	Verb	Adverb
credit exposure	Yes	No	No	No
sum of money	Yes	No	No	No

As nouns, sum of money is a hypernym of credit exposure; that is, sum of money is a word with a broader meaning than credit exposure:

credit exposure: the amount of money a bank has lent and may lose if it is not paid back.
sum of money: a quantity of money

Other hypernyms of credit exposure include amount, amount of money, sum.

credit exposure (noun)	sum of money (noun)
the amount of money a bank has lent and may lose if it is not paid back.	a quantity of money