affidavit, assurance, attestation, authority, authorization, avouch, avouchment, bail, bill of health, bond, certificate, certificate of proficiency, certification, clearance, countenance, credential, deposition, diploma, empowerment, enabling, enfranchisement, entitlement, faith, fiat, guarantee, guaranty, indemnity, insurance, navicert, notarized statement, note, oath, parole, pledge, plight, promise, ratification, sanction, security, sheepskin, solemn declaration, stocks and bonds, surety, sworn statement, testamur, testimonial, ticket, tie, troth, visa, vise, voucher, vow, warrant, witness, word, word of honor