Or search: hint, denote, advert, pertain
2 Syllables: SU
eunuch, fluid, humid, loosened, looted, rooted, ruined, stupid, suited, unit
3 Syllables: USU
computed, concluded, diluted, disputed, excluded, illumined, included, intruded, obtruded, polluted, protruded, reputed, saluted
4 Syllables: UUSU
disillusioned, Massachusetts

Found 25 words across 3 groupings. Skipped 3 excess words of a similar stem.