Oatmeal rhymes with:
cornmeal, piecemeal, ardshiel, audiophile, automobile, bonesteel, bookmobile, breazeale, cardiel, cartwheel, chrusciel, citisteel, clendaniel, cornmeal, dalziel, ezekiel, flywheel, glockenspiel, hartfiel, megadeal, newsreel, odneal, oldsmobile, piecemeal, rosensteel, rosenstiel, snowmobile, tarheel, treadwheel, vanderweele
Oatmeal sounds like:
o'donnel, o'donnell, odaniel, odneal, odonnel, odonnell