The word "constating" means to establish something as true or valid. Synonyms for this word could include affirming, confirming, validating, corroborating, verifying, substantiating, attesting to, and certifying. Each of these synonyms implies a sense of certainty or proof, as if to say that something has been definitively confirmed or established as true. Whether in a legal or everyday context, using synonyms for constating can provide variety in language and help to emphasize the importance of a statement or assertion.