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

Found 19 words across 3 groupings.