Or search: dubnium
2 Syllables: SU
almond, Aryan, audience, Austrian, common, Compton, conference, conscience, Constance, constant, convent, Johnson, Johnson's, Johnston, Jonson, Longman, Marian, omnium, quantum, Taunton, Thompson, Thompson's, Thomson, Thomson's, wanton
3 Syllables: USU
despondent, inconstant, preponderance, remonstrance, respondent, uncommon, Wisconsin
4 Syllables: USUU
embodiment
4 Syllables: UUSU
correspondence, correspondent

Found 35 words across 4 groupings. Skipped 7 excess words of a similar stem.