Synonyms and related words :
advocacy, advocating, advocation, affidavit, attestation, authority, authorization, bill of health, certificate, certificate of character, certificate of proficiency, certification, character, character reference, deposition, diploma, letter of introduction, navicert, notarized statement, note, patronage, recommend, recommendation, reference, sheepskin, sworn statement, testamur, testimonial, ticket, visa, vise, voucher, warrant, warranty, witness