1 Syllable: S
alms, aunt, balm, blond, blonde, bom, bomb, bon, bonds, Bonn, bonne, Braun, bronze, Caen, calm, com, Comm, Comp, Comte, con, Conde, Cong, Conn, cons, Const, Conte, dawn, dom, don, donned, dons, dont, drawn, fawn, fond, font, gaunt, gone, gong, Hahn, Han, haunt, homme, Hon, Hong, John, Jon, Jong, Juan, Kahn, Khan, Kong, launch, lawn, Lon, long, mam, mom, mon, monde, Mons, Mont, nom, non, on, palm, pawn, pomp, pon, ponds, Pons, Pont, Prom, prompt, Psalm, qualms, quam, rom, Ron, sawn, som, Somme, songs, spawn, staunch, strong, swamp, Swan, tang, taunt, thon, thong, throng, tian, Tom, tongs, Vaughan, von, wan, want, won, wrong, yawn, yon
2 Syllables: SU
baton, enfant, Islam, Milan
2 Syllables: US
along, Alphonse, anon, Antoine, avant, begone, belong, beyond, Ceylon, Durand, embalmed, ensconced, entente, foregone, Hassan, Iran, Koran, lifelong, prolong, respond, response, Rouen, salon, savant, Sorbonne, Taiwan, thereon, Toulon, upon, Vermont, whereon, withdrawn
3 Syllables: UUS

Found 152 words across 4 groupings. Skipped 45 excess words of a similar stem.