Authenticates is a word used to describe the process of verifying the legitimacy or genuineness of something. This word can be used in various contexts such as online transactions, identity verification, document validation, among others. Synonyms for authenticates include validate, verify, confirm, endorse, accredit, attest, certify, and corroborate. Each of these words has its own unique connotation and usage. For example, validate emphasises the legal or formal aspect of checking the accuracy of something, while verify describes the act of establishing the truth or accuracy of a claim or statement. Using synonyms can help to improve the clarity and precision of communication while avoiding repetition.