Or search: abyssal, unfathomable, unmeasurable
2 Syllables: SU
blissful, bristle, Bristol, chisel, civil, crystal, dismal, distal, fiscal, grizzled, Israel, Israel's, Michel, missile, Mitchell, pistol, rivalled, shrivelled, swivel, thistle, trivial, vigil, whistle, wishful, wistful
3 Syllables: USU
baptismal, convivial, dismissal, epistle, initial, judicial, official, peripheral
4 Syllables: UUSU
artificial, beneficial, interstitial, prejudicial, sacrificial, superficial, unofficial

Found 40 words across 3 groupings. Skipped 12 excess words of a similar stem.