Synonyms and related words :
autobus, bus, cab, carrier, carrier pigeon, chartered bus, diligence, double-decker, hack, hired car, homer, homing pigeon, jitney, mail car, mail packet, mail train, mail truck, mailer, mailplane, motor coach, motorbus, omnibus, packet boat, pigeon post, post boat, post car, post coach, post-horse, post-office car, poster, railway mail car, stage, stagecoach, taxi, taxicab