riprap, bulkheads, gabions, breakwaters, roadbeds, piers, berms, coquina, jetties, gabion, embankments, caissons, pilings, seawall, shoreline, fortifications, seaward, batture, landward, dikes, marsh, polders, inlets, wharfs, silt, groyne, crossbeams, sandbars, weirs, riverbanks, promontories, sluiceway, sandbanks, rills, understructure, crenellations, riverbed, shipworm, abutments, swales, marram grass, palisades, outwash, canals, davits, wetlands, gun emplacement, braes, sinkage, headlands, sedimentation, sand, subbase, anchorages, dunes, sediment, ponds, bailey bridge, hummock, structures, cofferdam, thatches, embayment, soakaway, causeway, bunkers, marshland, mangroves, rockwork, earthworks, retaining wall, motte, erosion, rusting, trestle bridge, pontoons, escarpments, tidal basin, millrace, oxbow, graving dock, maginot line, spalling, groins, streambed, dredging, posthole, boulders, intertidal, turtleback, canalization, marl, watercourses, outfall, tarmacadam, entrenchments, beach erosion, creosoted, hardpan, casuarinas, earthen, revetment, emplacements, aqueducts, grilles, lintels, doorways, moldings, buildings, coffins, fixtures, floors, moulds, pots, walling, barns