THESAURUS
estuary
arm, armlet, avenue, bay, bayou, belt, bight, blowhole, boca, channel, chute, cove, creek, debouch, door, egress, emunctory, escape, euripus, exhaust, exit, fjord, floodgate, flume, frith, gulf, gut, harbor, inlet, kyle, loch, loophole, mouth, narrow, narrow seas, narrows, natural harbor, opening, out, outcome, outfall, outgate, outgo, outlet, pore, port, reach, road, roads, roadstead, sally port, sluice, sound, spiracle, spout, strait, straits, tap, vent, ventage, venthole, vomitory, way out, weir
ROGET THESAURUS
estuary
Lake
N
gulf, lake, land covered with water, gulf, gulph, bay, inlet, bight,
estuary, arm of the sea, bayou, fiord, armlet, frith, firth, ostiary, mouth, lagune, lagoon, indraught, cove, creek, natural harbor, roads, strait, narrows, Euripus, sound, belt, gut, kyles, continental slope, continental shelf, lake, loch, lough, mere, tarn, plash, broad, pond, pool, lin, puddle, slab, well, artesian well, standing water, dead water, sheet of water, fish pond, mill pond, ditch, dike, dyke, dam, reservoir, alberca, barachois, hog wallow, lacustrine.