Synonyms and related words :
arm, armlet, bay, bayou, belt, bight, boca, bottleneck, canal, channel, cove, creek, defile, estuary, euripus, fjord, frith, gulf, gut, harbor, inlet, isthmus, kyle, loch, mouth, narrow, narrow seas, natural harbor, neck, pass, reach, road, roads, roadstead, sound, strait, straits, throat