Synonyms and related words :
abysm, abyss, aqueduct, arroyo, avenue, bed, blowhole, box canyon, breach, break, canal, canyon, cavity, channel, chap, chasm, check, chimney, chink, chute, cleft, cleuch, clough, col, coulee, couloir, crack, cranny, creek bed, crevasse, crevice, culvert, cut, cwm, debouch, defile, dell, dike, ditch, donga, door, draw, dry bed, egress, emunctory, escape, estuary, excavation, exhaust, exit, fault, fissure, flaw, floodgate, fracture, furrow, gap, gape, gash, gorge, groove, gulch, gulf, gully, gullyhole, headrace, hole, incision, irrigation ditch, joint, kloof, leak, loophole, moat, notch, nullah, opening, out, outcome, outfall, outgate, outgo, outlet, pass, passage, pore, port, race, ravine, rent, rift, rime, river bed, riverway, runnel, rupture, sally port, scissure, seam, slit, slot, sluice, spillbox, spillway, spiracle, split, spout, stream bed, streamway, swash, swash channel, tailrace, tap, trench, valley, vent, ventage, venthole, void, vomitory, wadi, water carrier, water channel, water furrow, water gap, water gate, watercourse, waterway, waterworks, way out, weir