Corroborating evidence is important when it comes to proving a claim or accusation. It provides additional support and validation for the original assertion. In cases where there is limited evidence, finding suitable synonyms for corroborating evidence can significantly make an argument stronger. Words like proof, validation, substantiation, confirmation, and authentication can be used to convey the same meaning. Other choices include authentication, attest, substantiate, vouch, and verify. Each of these synonyms can be used interchangeably with corroborating evidence to demonstrate the veracity of a claim or statement. It is essential to find the right synonym that best conveys the message you want to express.