The word credit can have many meanings — from giving someone the recognition they deserve, to providing goods or services for payment that comes at a later date.
The meanings of credit don't end with borrowing money to pay at a later date or giving someone your approval. Colleges offer credits for each course in which their students enroll. A volunteer who raises thousands of dollars each year is a credit — or source of pride — to his charitable organization. Add an -s to the end of the word, and you have the scroll of names at the end of a movie.