The word "validatory" refers to something that confirms or validates a particular statement or claim. Synonyms for this word include: corroborative, verifying, substantiating, justificatory, supporting, confirming, authenticating, and validating. These words all convey the idea that something has been confirmed as true or accurate. Other synonyms that could be used in certain contexts include: approving, backing, endorsing, warranting, and ratifying. Essentially, any word or phrase that lends credibility or support to the validity of a claim can be considered a synonym for "validatory".