2 Syllables: SU
Barrett, Bennet, Bennett, breasted, checklist, chemist, cherished, cleric, credit, crested, debit, desperate, epic, Eric, Erich, Essex, ethic, ethnic, fairest, ferric, Frederic, Frederick, garret, Garrett, Garrick, Herrick, menaced, merits, metric, nested, perished, prelate, relic, relished, respite, rested, Sedgwick, Senate, tested, vested, wrested, wretched
3 Syllables: SUU
3 Syllables: USU
acetic, aesthetic, angelic, appellate, arrested, ascetic, athletic, attested, authentic, barbaric, congested, cosmetic, decrepit, detested, divested, domestic, embellished, emetic, endemic, esthetic, generic, genetic, geometric, Hellenic, Homeric, hysterics, infested, invested, kinetic, magnetic, majestic, molested, obstetrics, pathetic, phonetic, poetic, polemic, prophetic, replenished, requested, suggested, symmetric, synthetic, systemic, theoretic, unblemished
4 Syllables: UUSU
academic, apathetic, arithmetic, atmospheric, diabetic, energetic, epidemic, esoteric, hygienic, pathogenic, sympathetic, undigested, unmolested
5 Syllables: UUUSU
6 Syllables: UUUUSU
Found 106 words across 6 groupings. Skipped 17 excess words of a similar stem.