* Credit: This is the most straightforward borrowing, retaining its meaning of belief, trust, or acknowledgment of something as true or valid. This is used in contexts such as academic credit, financial credit, and giving someone credit for something.
* Creditor: One who gives credit (financially).
* Creditable: Worthy of belief or trust; reputable; deserving of praise.
* Credibility: The quality of being believable or trustworthy.
* Incredible: Not believable; amazing. Note the prefix "in-" negates the meaning.
* Credence: Belief or trust.
* Credential: Something that provides evidence of a person's qualifications, competence, etc. (from the idea of something that is believed or trusted to be true).
These are some of the most common and direct derivatives. There might be less common or more obscure words derived from "credit" as well.