Corroboratory is an adjective used to describe an item or piece of evidence that supports or confirms another piece of evidence. It can be used in various contexts, including legal proceedings, scientific research, and everyday language. There are several synonyms for the word "corroboratory," including confirmatory, supportive, validating, substantiating, and corroborating. Each of these words has a slightly different meaning, but they all refer to the act of providing evidence that supports a claim or argument. By using synonyms for "corroboratory," writers and speakers can vary their language and make their points more clearly and effectively.