Bridge, a structure for spanning physical obstacles such as a river, canal, or roadway, has numerous synonyms. Some of the most commonly used synonyms for bridge include span, viaduct, causeway, overpass, arch, flyover, traverse, and conduit. Span refers to a structure that crosses over a gap, typically a body of water. Viaduct is a bridge that consists of several small spans that are carried on arcades or pillars. A causeway is an elevated roadway or embankment that crosses a low or wet place, like a swamp or a shallow body of water. Overpass is a bridge that goes over a road or railway. Arch is a curved structure supporting weight from above. Flyover is a bridge or section of a road that passes over another road. Traverse is a crosspiece that aims to provide stability. Conduit is a channel for conveying water or other fluids.