2 Syllables: SU
beetle, Cecil, cereal, diesel, eagle, easel, equal, equalled, equals, evil, feeble, fetal, genial, legal, lethal, measles, medial, menial, needful, needle, peaceful, penal, people, regal, renal, sequel, serial, siecle, steeple, venal, venial, weasel
3 Syllables: USU
adrenal, arterial, bacterial, coeval, congenial, deceitful, enfeebled, ethereal, funereal, illegal, imperial, material, medieval, primeval, retrieval, unequal, unequalled, upheaval, venereal
4 Syllables: UUSU
Found 57 words across 3 groupings. Skipped 13 excess words of a similar stem.