2 Syllables: SU
blissful, bristle, Bristol, cereal, chisel, civil, crystal, dismal, distal, filial, fiscal, grizzled, Israel, Israel's, lineal, Michel, missile, Mitchell, pistol, rivalled, serial, shrivelled, swivel, thistle, trivial, vigil, vitriol, whistle, wishful, wistful
3 Syllables: USU
arterial, bacterial, baptismal, dismissal, epistle, ethereal, imperial, initial, judicial, material, official, peripheral, venereal
4 Syllables: UUSU
artificial, beneficial, immaterial, interstitial, managerial, prejudicial, sacrificial, superficial, unofficial
Found 52 words across 3 groupings. Skipped 14 excess words of a similar stem.