2 Syllables: SU
bearer, Becker, beggar, better, cellar, center, checkered, chequered, Cheshire, Chester, clever, debtor, Decker, desert, dresser, dweller, Edward, effort, enter, error, Esther, ever, fairer, feather, feller, fetter, Fletcher, fresher, gesture, gether, guesswork, heather, heavier, heifer, Heller, Hester, jester, Keller, Kepler, leather, leathern, ledger, Leicester, leisure, Leonard, leopard, leper, lesser, Lester, letter, lever, measure, Messrs, Nestor, nether, network, never, peddlers, pepper, pestered, pleasures, pressure, rarer, record, redder, seller, setter, settler, sever, Severn, sharer, Shepard, shepherd, Sheppard, stellar, stretcher, sweater, teller, tenor, terror, tester, tether, treasure, tremor, Trevor, vesture, wearer, weather, Weber, Western, westward, whether, zephyr
3 Syllables: USU
abettors, aggressor, assessor, confessor, displeasure, dissenters, endeavor, endeavour, forever, however, investor, MacGregor, midwestern, Northwestern, oppressor, possessor, Professor, propeller, semester, sequestered, soever, southwestern, successor, Sylvester, together, transgressors, unfettered, unlettered, unmeasured, whatever, whenever, wherever, whichever, whoever
4 Syllables: UUSU
5 Syllables: UUUSU
Nebuchadnezzar, whithersoever
Found 135 words across 4 groupings. Skipped 58 excess words of a similar stem.