Niels rhymes with:
corniel's, neal's, neels, neil's, neils, o'neill's, abeles, appeals, beales, beals, conceals, corniel's, deal's, deals, eales, eels, feels, freels, heals, heels, ideal's, ideals, jarriel's, keels, meal's, meals, neal's, neels, neil's, neils, o'neill's, ordeals, peels, reels, repeals, reseals, reveals, seal's, seales, seals, shiels, skeels, squeals, steals, steel's, steels, veals, wheels
Niels sounds like:
nails, nalco, nalls, nameless, neal's, nealis, neels, nehls, neil's, neils, nelles, nellis, nels, newell's, newhall's, niles, nilges, nilles, nils, noel's, nolasco, noles, nolls, nowels, nylex