| support(approval, proof, verification, endorsement, validation) |
| affirmation(noun, proof, verification, endorsement, authentication) |
| authentication(noun, approval, proof, verification, endorsement) |
| corroboration(noun, approval, proof, assent, verification) |
| sanction(noun, permit, approval, evidence, proof) |
| signed passport |
| validation(noun, approval, encouragement, authorization, proof) |
| warrant(noun, order, permit, record, contract) |
| affirm |
| attestation(proof, verification, endorsement, authentication, substantiation) |
| authenticate |
| authorize |
| certificate(noun, order, permit, record, contract) |
| certification(noun, order, record, contract, grant) |
| confirm |
| go-ahead(noun, permit, document, license, patent) |
| go ahead(expression, approval, proof, verification, endorsement) |
| green light(noun, expression, permit, approval, evidence) |
| hand |
| nod(approval, proof, verification, endorsement, validation) |