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2 Syllables: SU
Arctic, artist, Bartlett, carted, charted, darted, garlic, garnished, guarded, hardship, hearted, Margaret, Margaret's, market, Marxist, parted, started, tarnished, varnished, yardstick
3 Syllables: USU
bombarded, departed, discarded, imparted, lethargic, regarded, retarded, uncharted, unguarded
4 Syllables: UUSU
disregarded

Found 30 words across 3 groupings. Skipped 4 excess words of a similar stem.