3 Syllables: SUU
favorably, miserably, preferably, usually
4 Syllables: SUUU
admirably, favourably, honorably, honourably, humorously, ludicrously, superfluities, tolerably
5 Syllables: USUUU
considerably, gratuitously, incomparably, inexorably, inseparably, intolerably, unalterably, unfavorably, unfavourably
6 Syllables: UUSUUU
constitutionally, longitudinally

Found 23 words across 4 groupings.