Confirmation
Proof, verification, corroboration, authentication, documentation, backing for, grounds for, confirmation, substantiation, affirmation, attestation, support for, and reinforcement for.
Verification
Proof, verification, corroboration, authentication, documentation, backing for, grounds for, statement, declaration, plea, claim, charge, deposition, affidavit, averment, confirmation, substantiation, affirmation, attestation, support for, reinforcement for, testimony, sworn statement, avowal, submission, contention, allegation, representation, and asseveration.
Indications
Signs, pointers, traces, hints, indications, marks, suggestions, and manifestation.