2 Syllables: SU
benches, blemish, census, chemist, Denis, Dennis, dentist, emblems, endings, endless, engines, ensigns, envious, fences, Flemish, friendless, Greenwich, hemorrhage, Jenkins, Kenneth, Kentish, lenses, Memphis, menace, mentions, pensions, pensive, plenteous, premise, Prentice, senseless, senses, spendthrift, strengthens, tempest, tendons, tennis, tenses, tensions, trenches, Venice
3 Syllables: USU
appendage, apprentice, assemblage, attentions, attentive, commences, compendious, condenses, consensus, contentions, contentious, conventions, defenceless, defences, defenseless, defensive, dilemmas, dimensions, dispenses, dissensions, exemptions, expenses, expensive, extensions, extensive, incentive, intensive, intentions, inventions, inventive, licentious, momentous, offences, offenses, offensive, percentage, portentous, pretences, pretensions, pretentious, preventive, relentless, replenish, retentive, sententious, stupendous, suspensions, tremendous, unblemished, Vincennes
4 Syllables: UUSU
apprehensions, apprehensive, comprehensive, conscientious, inattentive, inexpensive, inoffensive, interventions, unpretentious
Found 100 words across 3 groupings. Skipped 7 excess words of a similar stem.