Or search: flatly, categorically
3 Syllables: SUU
busily, chivalry, dismally, functionally, literally, miserably, nationally, rationally, Sicily, visually, wistfully
4 Syllables: SUUU
criminally, liberally, literacy, marginally, nominally, personally, rigorously, vigorously
4 Syllables: USUU
conditionally, deliberately, exceptionally, initially, judicially, officially, originally, proportionally, provisionally, traditionally
5 Syllables: USUUU
Additionally, considerably, conventionally, diagonally, episcopacy, illiteracy, intentionally, legitimacy, legitimately, occasionally, professionally, reciprocally
5 Syllables: UUSUU
artificially, beneficially, educationally, individually, unequivocally, unintentionally, unofficially
6 Syllables: UUSUUU
constitutionally, illegitimacy, indiscriminately, longitudinally, superficiality

Found 53 words across 6 groupings.