Or search: lap, orb, arena, gamut, realm, skull, sweep, ambit, cavum, cavity, domain, pallet, sphere, compass, expanse
2 Syllables: SU
boarded, corporate, florid, horrid, laureate, morbid, Norfolk, orbits, orchids, portrait, sordid, thwarted, torpid, torrid, warmest
3 Syllables: USU
afforded, appropriate, contorted, deported, distorted, exported, recorded, reported, rewarded, supported, transported
4 Syllables: UUSU
Nonconformists

Found 27 words across 3 groupings. Skipped 1 excess word of a similar stem.