Synonyms and related words :
advertisement, affiche, announcement, banner, bill, billboard, broadside, carrier, carrier pigeon, circular, flier, handbill, homer, homing pigeon, mail car, mail coach, mail packet, mail train, mail truck, mailer, mailplane, notice, packet boat, pigeon post, placard, post boat, post car, post coach, post-horse, post-office car, railway mail car, sign, signboard