2 Syllables: SU
Bourbons, burdens, Burgess, circus, courteous, curtains, Curtis, earliest, Ernest, firmest, firmness, furnace, furthest, Germans, kerchief, nervous, nurses, Perkins, Perseus, Persians, persons, purchase, purpose, sermons, service, spurious, sternest, sternness, surface, surgeons, surges, surplus, turbans, urchins, urges, versions, versus, virgins, workman's, workmen's, worthiest, worthless
3 Syllables: USU
alertness, aspersions, assertions, conversions, desertions, determines, diversions, encourage, excursions, exertions, impervious, incursions, luxurious, perversions, reverses, traverses
4 Syllables: UUSU
5 Syllables: UUUSU
Found 60 words across 4 groupings. Skipped 6 excess words of a similar stem.