2 Syllables: SU
Barrett, Bennet, Bennett, blemish, checklist, chemist, cherish, cleric, credit, debit, Denis, Dennis, desperate, devilish, dwelleth, Ellis, else's, epic, Eric, Erich, Essex, ethic, fairest, ferric, fetish, Flemish, Frederic, Frederick, garish, garret, Garrett, Garrick, Greenwich, Harris, hellish, Herrick, menace, merits, metric, Paris, parish, perish, prelate, premise, reddish, relic, relish, respite, selfish, Senate, sheriff, sheriff's, tennis, Venice
3 Syllables: SUU
3 Syllables: USU
acetic, aesthetic, angelic, appellate, ascetic, athletic, authentic, barbaric, cosmetic, decrepit, domestic, embellish, emetic, endemic, esthetic, generic, genetic, geometric, Hellenic, Homeric, hysterics, kinetic, magnetic, majestic, obstetrics, pathetic, phonetic, poetic, polemic, prophetic, replenish, symmetric, synthetic, systemic, theoretic, unblemished, unselfish
4 Syllables: UUSU
academic, apathetic, arithmetic, atmospheric, diabetic, energetic, epidemic, esoteric, hygienic, pathogenic, sacrilegious, sympathetic
5 Syllables: UUUSU
6 Syllables: UUUUSU
Found 108 words across 6 groupings. Skipped 22 excess words of a similar stem.