2 Syllables: SU
3 Syllables: SUU
bearable, cerebral, clerical, credible, decimal, edible, equable, festival, genital, legible, medical, parables, pedestal, plentiful, preferable, Reginald, seminal, several, skeletal, tenable, terrible, variable
4 Syllables: USUU
accessible, amenable, chimerical, confessional, congenital, Congressional, detestable, ephemeral, execrable, illegible, impeccable, incredible, ineffable, invariable, numerical, polemical, professional, referable, regrettable, unbearable, untenable
5 Syllables: UUSUU
hypothetical, imperturbable, inaccessible, incontestable, indigestible, inexpressible, irrepressible, unforgettable
6 Syllables: UUUSUU
Found 54 words across 5 groupings. Skipped 6 excess words of a similar stem.