airship, dirigible
['black swan, Cygnus atratus', 'beacon, lighthouse, beacon light, pharos', 'bathtub, bathing tub, bath, tub', 'loudspeaker, speaker, speaker unit, loudspeaker system, speaker system', 'leatherback turtle, leatherback, leathery turtle, Dermochelys coriacea', 'whistle', 'bullet train, bullet']