Or search: alas, regrettably
3 Syllables: SUU
custody, cutlery, drudgery, frantically, gluttony, luckily, lustily, nunnery, shrubbery, subtleties, subtlety, subtly, summary, Tuscany
3 Syllables: USU
discovery, recovery
4 Syllables: USUU
microscopy
5 Syllables: UUSUU
paradoxically, unequivocally
6 Syllables: UUUSUU
involuntarily

Found 20 words across 5 groupings.