Sputter rhymes with:
putter, aflutter, butter, clutter, cutter, dutter, flutter, gutter, hutter, kutter, lutter, mutter, nutter, putter, rutter, schutter, shutter, stutter, sutter, utter, what're
Sputter sounds like:
saavedra, sabedra, saboteur, savedra, sceptre, septer, shifter, softer, software, spadaro, spader, spataro, spatter, speeder, speedier, spider, spiteri, spotter, swifter