2 Syllables: SU
Arctic, Bartlett, carted, charted, darted, garlic, guarded, hardship, hearted, Margaret, Margaret's, market, parted, started, yardstick
3 Syllables: USU
Antarctic, bombarded, departed, discarded, imparted, lethargic, regarded, retarded, uncharted, unguarded
Found 25 words across 2 groupings. Skipped 2 excess words of a similar stem.