Synonyms of 'floodgate'

air lock, avenue, blowhole, channel, chute, debouch, door, egress, emunctory, escape, estuary, exhaust, exit, flume, gate, head gate, lock, loophole, opening, out, outcome, outfall, outgo, outlet, penstock, pore, port, sally port, sluice, spiracle, spout, tap, tide gate, vent, ventage, vomitory, water gate, weir