2 Syllables: SU
Benson, Bentham, Benton, Bremen, Clemens, Clement, emblem, engine, ensign, entrance, Fenton, Jenkins, Jensen, Kenyon, lemon, lengthen, Lenin, mention, penance, penchant, pendant, pendent, Penguin, pennant, pension, Plenum, remnant, semblance, sentence, sentient, strengthened, strengthens, temperance, tenant, tendon, tension, trenchant, Trenton, vengeance, venom
3 Syllables: SUU
3 Syllables: USU
abstention, amendment, ascendant, ascension, attendance, attendant, attention, commencement, compendium, contention, contentment, convention, declension, defendant, dependant, dependence, dependent, descendant, detention, dimension, dissension, entrenchments, exemption, extension, intention, invention, Lieutenant, millennium, momentum, presentment, pretension, prevention, redemption, remembrance, repentance, repentant, resemblance, resentment, resplendent, retention, retrenchment, suspension, transcendence, transcendent
4 Syllables: UUSU
apprehension, comprehension, condescension, contravention, hypertension, inattention, independence, independent, intervention, referendum
5 Syllables: UUUSU
Found 100 words across 5 groupings. Skipped 40 excess words of a similar stem.