2 Syllables: SU
arches, Arden, ardent, arson, Aryan, audience, Austin, Austrian, awesome, bargain, barges, Barton, blossom, Boston, carbon, Carleton, Carlton, Carmen, Carson, Carthage, cartridge, caution, Charleston, Charlton, Clarkson, darken, Dartmouth, Dawson, garden, garland, garment, guardian, harden, Harlem, Hartmann, hearken, Hodgson, Hoffman, Hoffmann, jargon, Lawson, lodgment, margin, Marian, Markham, marshes, Marston, Martin, Martin's, Moslem, Nostrand, nostrum, often, parchment, pardon, parlance, parson, partridge, province, rostrum, Sargent, sergeant, Serjeant, sharpen, soften, sovereign, Spartan, watchman, Yarmouth
3 Syllables: SUU
3 Syllables: USU
4 Syllables: USUU
4 Syllables: UUSU
Found 80 words across 5 groupings. Skipped 31 excess words of a similar stem.