The word that contains a word root that means "believe" is "credential".
Explanation:
Credential comes from the Latin "credere", which means to believe. In its origin, credentials were exposed before who had the authority to demand them to verify the authorization, prerogative or right that the person carrying the credential claimed to have. For example, credentials of passage through certain roads, or credentials of livestock property. By displaying the credential, the authority "believed" that what this person claimed was true.
The word that contains a word root that means "believe" is the word "credential". Latin root word of Credential "cred-" means believe. It has also the same meaning of the root words of the English words "credit" and "credo". The word credential means a qualification or an identification of one's identity.
