2 Syllables: SU
90, blindly, blithely, brightly, crises, dryly, finely, Friday, grimy, highly, hygiene, icy, idly, ivy, kindly, knightly, lightly, likely, lively, mighty, mildly, nicely, nightly, nineties, ninety, psyche, Reilly, rightly, Riley, shiny, shyly, slightly, slimy, slyly, spicy, sprightly, tidy, tightly, timely, tiny, widely, wildly, Wiley, wily, windy, wisely
3 Syllables: USU
Almighty, concisely, designedly, divinely, Hawaii, politely, precisely, unkindly, unlikely, unsightly, untidy, untimely, unwisely
4 Syllables: UUSU
Found 60 words across 3 groupings. Skipped 1 excess word of a similar stem.