Or search: prof, module, volition, retention, sensation, sentience, sentiency, retentivity
2 Syllables: SU
actually
3 Syllables: SUU
battlefield, casualties, faculty, happily, Magdalene, tactfully
4 Syllables: USUU
unhappily
5 Syllables: UUSUU
satisfactorily

Found 9 words across 4 groupings. Skipped 1 excess word of a similar stem.