2 Syllables: SU
Berwick, Burgess, Burnet, burnished, churches, Church's, churlish, circuit, circus, courage, courteous, curses, Curtis, earliest, earnest, firmest, firmness, flourish, furnace, furnish, furthest, furtive, girlish, hermit, kerchief, merges, nervous, nourish, nurses, perches, perfect, permit, Perseus, purchase, purges, purplish, purpose, purses, scourges, searches, service, skirmish, spurious, sternest, sternness, surface, surfeit, surges, surplus, target, Turkish, turnip, urges, verdict, verses, versus, worketh, worship, worshipped, worships, worthiest, worthless
3 Syllables: SUU
3 Syllables: USU
alertness, allergic, assertive, coercive, discourage, discursive, encourage, illustrious, imperfect, impervious, industrious, interpret, luxurious, researches, reverses, subversive, traverses
4 Syllables: UUSU
Found 81 words across 4 groupings. Skipped 16 excess words of a similar stem.