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2 Syllables: SU
desperate, Frederick, separate
3 Syllables: SUU
Arabic, Baroness, Benedict, benefice, benefit, derelict, essences, Federalists, feminist, heretic, Methodist, Nemesis, preferences, prejudice, references, rhetoric, separates, specialist, terrorist, therapist
4 Syllables: USUU
excrescences, expressionless, unprejudiced

Found 26 words across 3 groupings. Skipped 3 excess words of a similar stem.