Synonyms and related words :
affidavit, attestation, authority, authorization, bill of health, brevet, certificate, certificate of proficiency, certification, charter, concession, credential, deposition, franchise, grant, letters patent, liberty, navicert, notarized statement, note, patent, royal grant, sheepskin, sworn statement, testamur, testimonial, ticket, visa, vise, voucher, warrant, warranty, witness,