Diploma rhymes with:
coloma, loma, paloma, papilloma, saloma, sloma, algoma, aroma, bancoklahoma, bouma, carcinoma, choma, coloma, coma, douma, glaucoma, goma, homa, leoma, loma, luoma, lymphoma, melanoma, mesothelioma, moma, multnomah, naoma, neoma, nujoma, oklahoma, oma, paloma, papilloma, poma, retinoblastoma, roma, saloma, scoma, shiroma, sloma, soma, sonoma, stroma, sumatoma, tacoma, thoma, toma, troma, xoma
Diploma sounds like:
davlin, deblum, depalma, devlin, dipalma, dublin