Oppenheim rhymes with:
blenheim, guggenheim, guggenheim's, hochenheim, kuenheim, wineheim, anaheim, blenheim, durkheim, guggenheim, guggenheim's, hochenheim, ingelheim, kuenheim, nesheim, opheim, solheim, sondheim, straszheim, sundheim, waldheim, warehime, werdesheim, windheim, wineheim
Oppenheim sounds like:
o'banion, o'bannon, obama, obanion, obannon, obon, offen, open, opheim, opine, opinion, opium, oven, ovum