projectile, missile
['bannister, banister, balustrade, balusters, handrail', 'thresher, thrasher, threshing machine', 'worm fence, snake fence, snake-rail fence, Virginia fence', 'seashore, coast, seacoast, sea-coast', 'Gila monster, Heloderma suspectum', 'loudspeaker, speaker, speaker unit, loudspeaker system, speaker system', 'triumphal arch']