Or search: aa, ally, link, mate, peer, unite, assort, escort, player, adjunct, connect, consort, partner, compeer, pardner
2 Syllables: SU
boasted, bolted, coated, floated, folded, laureate, loaded, molded, noted, opiate, poet, roasted, Roebuck, scolded, Soviet, voted
3 Syllables: USU
appropriate, associates, denoted, devoted, eroded, exploded, outmoded, Potomac, promoted, revolted, unfolded, unloaded
4 Syllables: USUU
appropriates, dissociate, negotiate

Found 31 words across 3 groupings. Skipped 2 excess words of a similar stem.