Or search: hawk, hound, circus, attacker, harasser, aggressor, assailant, assaulter
2 Syllables: SU
barrier, bearer, carrier, error, fairer, fervour, heavier, Herder, rarer, readier, sharer, steadier, terrier, terror, verdure, wearer
3 Syllables: SUU
severer

Found 17 words across 2 groupings. Skipped 5 excess words of a similar stem.