Or search: carsick, seasick
2 Syllables: SU
Barrett, cleric, Eric, Erich, ferric, garret, Garrett, Garrick, Herrick, merits, turbid
3 Syllables: SUU
disparate
3 Syllables: USU
accursed, barbaric, generic, Homeric, hysterics, unlearned
4 Syllables: UUSU
atmospheric, disconcerted, esoteric

Found 21 words across 4 groupings. Skipped 1 excess word of a similar stem.