Credit rating and Letter of credit

Credit rating noun - An estimate, based on previous dealings, of a person's or an organization's ability to fulfill their financial commitments.

Letter of credit and credit rating are semantically related. In some cases you can use "Letter of credit" instead a noun phrase "Credit rating".

Letter of credit noun - A document issued by a bank that guarantees the payment of a customer's draft; substitutes the bank's credit for the customer's credit.

Credit rating and letter of credit are semantically related. You can use "Credit rating" instead a noun phrase "Letter of credit".