Or search: bream, brama
2 Syllables: SU
Ahmed, bonded, bonnet, comet, conduct, conduits, construct, fondest, gauntlet, haunted, longest, prompted, strongest, vomit
3 Syllables: USU
Mahomet, misconduct, responded, unconquered

Found 18 words across 2 groupings. Skipped 3 excess words of a similar stem.