Pylon

Noun

 * 1) A gateway to the inner part of an Ancient Egyptian temple
 * 2) A tower like structure, usually one of a series, used to support high voltage electricity cables.
 * 3)  A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage.
 * 4) An obelisk.
 * 5) A traffic cone.

Thesaurus
French door, antenna tower, archway, back door, barbican, barway, beacon, beam, belfry, bell tower, bulkhead, campanile, carriage entrance, cellar door, cellarway, colossus, column, cupola, derrick, dome, door, doorjamb, doorpost, doorway, fan marker, fire tower, flare path, front door, gate, gatepost, gateway, hatch, hatchway, lantern, lighthouse, lintel, marker, martello, martello tower, mast, minaret, monument, obelisk, observation tower, pagoda, pilaster, pillar, pinnacle, pole, porch, portal, porte cochere, postern, propylaeum, pyramid, racon, radar beacon, radio beacon, scuttle, shaft, side door, skyscraper, spire, standpipe, steeple, stile, storm door, stupa, television mast, threshold, tollgate, tope, tour, tower, trap, trap door, turnpike, turnstile, turret, water tower, wind cone, wind indicator, wind sock, windmill tower