Flutter rhymes with:
aflutter, aflutter, clutter, lutter, aflutter, butter, clutter, cutter, dutter, gutter, hutter, kutter, lutter, mutter, nutter, putter, rutter, schutter, shutter, sputter, stutter, sutter, utter, what're
Flutter sounds like:
falter, felder, felter, fielder, filter, flater, flatter, flattery, flatware, floater, floodwater, folder, fulwider