Or search: egg, ray, zap, bass, bomb, nuke, pelt, blast, shell, snipe, shawm, assail, assault, barrage, physics
2 Syllables: SU
Arctic, Bartlett, carted, charted, darted, garlic, guarded, hardship, hearted, Margaret, Margaret's, market, parted, started, yardstick
3 Syllables: USU
Antarctic, departed, discarded, imparted, lethargic, regarded, retarded, uncharted, unguarded
4 Syllables: UUSU
disregarded

Found 25 words across 3 groupings. Skipped 2 excess words of a similar stem.