Or search: intelligibly
3 Syllables: SUU
amnesty, angrily, Antony, anxiously, bankruptcy, canopy, Chancery, fantasy, frantically, handsomely, manfully, randomly, sanity, scantily, thankfully, vanities, vanity
4 Syllables: USUU
calamities, calamity, financially, insanity, philanthropy, profanity, substantially
5 Syllables: UUSUU
inhumanity, instantaneously

Found 26 words across 3 groupings.