2 Syllables: SU
Alban, Alden, almonds, Alton, Arden, ardent, aren, arson, Aryan, Austrian, Baldwin, Balkan, balsam, bargain, Barton, carbon, Carleton, Carlton, Carmen, Carson, cauldron, Charlton, Clarkson, Dalton, darken, dolphin, foreign, garden, garland, garment, guardian, harden, Harlem, Hartmann, hearken, jargon, margin, Marian, Markham, Marston, Martin, Martin's, parchment, pardon, parlance, parson, Sargent, sergeant, Serjeant, sharpen, solvent, Spartan, thraldom, Walden, Waltham, Walton
3 Syllables: SUU
Donaldson
3 Syllables: USU
apartment, bombardment, compartment, department, disheartened, enlargement, insolvent, installment, instalment, involvement
4 Syllables: UUSU
Found 68 words across 4 groupings. Skipped 28 excess words of a similar stem.