2 Syllables: SU
Becker, Bedford, beggar, better, checkered, chequered, debtor, Decker, Dexter, Edgar, Edward, excerpt, expert, fetter, Hector, Kepler, lecture, leopard, leper, letter, nectar, network, peddlers, pepper, readier, record, rector, redder, sceptre, sector, setter, settler, Shepard, shepherd, Sheppard, specter, spectre, steadier, sweater, texture, vector, Weber, Webster, Webster's
3 Syllables: USU
abettors, collectors, conjecture, detector, director, elector, inspector, MacGregor, objector, preceptor, projector, protector, reflector, unfettered, unlettered
Found 59 words across 2 groupings. Skipped 34 excess words of a similar stem.