2 Syllables: SU
aerial, Ariel, bestial, Bethel, burial, careful, devil, Ethel, ethyl, festal, level, levelled, levels, methyl, nestle, pestle, prayerful, restful, revel, revelled, revels, special, vessel, vestal, wrestle
3 Syllables: USU
ancestral, biennial, celestial, Centennial, dishevelled, especial, Ezekiel, malarial, orchestral, perennial, successful, terrestrial, triennial
4 Syllables: UUSU
Found 40 words across 3 groupings. Skipped 7 excess words of a similar stem.