Disbelief and disbelieve are two words that are often confused with each other. Disbelief is a noun that means a lack of acceptance or trust in something as true. On the other hand, disbelieve is a verb that means to not believe in something or someone. Thus, you can use disbelief to describe a feeling or a state of mind, while disbelieve is used to express an action. For example: "I am in disbelief that he won the race" vs "I disbelieve his story."