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3 Syllables: SUU
medical, metrical, sceptical, skeptical, technical
4 Syllables: USUU
electrical, heretical, poetical, receptacles, symmetrical
5 Syllables: UUSUU
alphabetical, antithetical, arithmetical, asymmetrical, dialectical, directional, geometrical, hypothetical, imperceptible, theoretical

Found 20 words across 3 groupings.