| A | B |
| Accreditation | Granting approval or belief in a school |
| Credential | A document that proves a person is believable |
| Credible | Believable; reliable |
| Credit | To believe that someone will do something |
| Creditor | A person who believes that he will be paid back the money that he loaned |
| Credulous | Tending to believe too easily; easily fooled |
| Creed | A set of religious beliefs |
| Discredit | To refuse to believe; to reject as untrue |
| Incredible | Not believable; improbable; unlikely |
| Incredulous | Doubting; unwilling or unable to believe |