3 Syllables: SUU
frantically, functionally, nationally, naturally, rationally
4 Syllables: SUUU
adequacy, casually, criminally, laterally, marginally, nominally, passionately, personally
4 Syllables: USUU
conditionally, exceptionally, originally, proportionally, provisionally, traditionally, unnaturally
5 Syllables: USUUU
Additionally, conventionally, dispassionately, inadequately, intentionally, occasionally, professionally, unanimously
5 Syllables: UUSUU
educationally, unconditionally, unintentionally
6 Syllables: UUSUUU
constitutionally, longitudinally

Found 33 words across 6 groupings.