watch-tower

n high tower from which guards keep watch, eg in a forest to look for forest fires, or a fortified observation post 了望台.

wassail, wastage, waste, waste on, waste product, waste-basket (also `waste-bin), waste-paper, waste-pipe, wasteful, wastefully, wastefulness, wasteland, waster, wastrel, watch, watch out for, watch over, watch-dog, watch-night service, watch-strap (Brit) (US `watch-band), watchdog, watcher, watchful, watchfully, watchfulness, watching brief, watchmaker, watchman, watchword, water, water point, water polo, water ski, water-bed, water-bird, water-biscuit, water-borne, water-bottle, water-buffalo, water-butt,