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A synonym for valid could be credible or legal.
prompt, assure, prove, satisfy
confirm prove authenticate validate substantiate corroborate attest From Merriam-Webster.
certify, approve, confirm, check out, document, prove, endorse, support, verify, validate
prove, show, indicate, manifest, make clear, display, indicate, exhibit, illustrate
Prove is a verb : Sally proved to the jury that she was innocent. I belive perhaps you are looking for a synonym for the word prove, regardless though a verb is a verb is a verb--there exists no noun form for the word prove or any other verb that I am aware of
Depending on context, "support" can mean brace, carry, prove, favor, money, funds, votes.
There are several synonyms for the word aver. Some of these include: affirm, assert, avouch, claim, contend, insist, justify, predicate, proclaim, prove, state, and verify.
What is synonym for merchant? What is synonym for merchant?
synonymize
What is the synonym government.
you are a synonym of abandoned.