2 Syllables: SU
benches, blemish, checklist, chemist, cherish, clerics, credits, Dennis, dentist, devilish, Ellis, epics, Essex, ethics, fairest, fences, fetish, Flemish, garish, Greenwich, Harris, hellish, Kenneth, Kentish, lenses, Memphis, menace, merits, Paris, parish, pensive, perish, prelates, premise, Prentice, reddish, relics, relish, senses, sheriff, sheriff's, spendthrift, tennis, tenses, trenches, Venice
3 Syllables: USU
aesthetics, appendage, apprentice, assemblage, athletics, attentive, condenses, cosmetics, defenses, defensive, dispenses, domestics, embellish, expenses, expensive, extensive, genetics, hysterics, incentive, intensive, inventive, kinetics, obstetrics, offenses, offensive, percentage, Poetics, polemics, preventive, relentless, replenish, retentive, unblemished
4 Syllables: UUSU
academics, apprehensive, comprehensive, epidemics, inattentive, inexpensive, inoffensive, sacrilegious
Found 87 words across 3 groupings. Skipped 9 excess words of a similar stem.