Manslaughter rhymes with:
backwater, breakwater, bridgewater, bywater, clearwater, coldwater, deepwater, drinkwater, fitswater, fitzwater, floodwater, freshwater, goldwater, granddaughter, headwater, pinkwater, rainwater, sidewater, stepdaughter, stillwater, tidewater, underwater, wastewater, whitewater
Manslaughter sounds like:
macallister, mcalister, mcallister, mccalister, mccallister, mccollister, mclester