2 Syllables: SU
beetle, Cecil, cheerful, Cyril, diesel, eagle, easel, equal, equalled, equals, evil, fearful, feeble, fetal, legal, lethal, measles, needle, penal, people, regal, renal, sequel, siecle, steeple, tearful, venal, virile, weasel
3 Syllables: SUU
3 Syllables: USU
adrenal, cathedral, coeval, enfeebled, funereal, illegal, medieval, primeval, retrieval, unequal, unequalled, upheaval
4 Syllables: UUSU
Found 45 words across 4 groupings. Skipped 12 excess words of a similar stem.