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Campanile - Bell tower, often set some distance away from its church.

Canopy - A projection or hood over a door, window, niche, etc.

Cantilever - A projecting elements, such as a beam or porch, supported at a single point or along a single line by a wall or column, stabilized by s counterbalancing downward force around the point of fulcrum.

Capital - The elaboration at the top of a column, pillar, pier or pilaster.