A gallows is a structure designed to cause death by hanging. It was typically used to execute criminals. Depending on how far the person being hanged is allowed to fall, death is caused by either strangulation on a short drop, or by having their neck broken on a long drop.
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A grille is a metal grate used as a decorative and protective covering, especially for a car or a fireplace.
Gutters are channels that are used to carry water away to somewhere else. Gutters can be found around the edges of a roof, to catch the water and take it to storage or into a drain. Gutters are also found at the edges of roads, and sometimes also in the center of a road, to carry water away from the surface of the road.