Floodwater rhymes with:
coldwater, goldwater, headwater, sidewater, tidewater, backwater, breakwater, bridgewater, bywater, clearwater, coldwater, deepwater, drinkwater, fitswater, fitzwater, freshwater, goldwater, headwater, pinkwater, rainwater, sidewater, stillwater, tidewater, underwater, wastewater, whitewater
Floodwater sounds like:
falter, felder, felter, fielder, filter, flater, flatter, flattery, flatware, floater, flutter, folder, fulwider