Or search: offish, unreached, unreachable, standoffish, inaccessible, unaccessible
3 Syllables: SUU
horrible, notable, oracle, sociable
4 Syllables: SUUU
emotional
4 Syllables: USUU
adorable, controllable, deplorable, devotional, disposable, negotiable, promotional, unknowable
5 Syllables: UUSUU
inconsolable, irreproachable, oratorical, uncontrollable

Found 17 words across 4 groupings. Skipped 2 excess words of a similar stem.