2 Syllables: SU
Bender, censor, censure, center, centre, denser, Denver, embers, enter, fender, gender, gentler, lender, Leonard, member, mentor, render, sender, slender, Spencer, Spencer's, Spenser, splendor, splendour, temper, Templars, tempter, tender, tenor, tenure, tremor, vendor, venture
3 Syllables: USU
adventure, avenger, condenser, December, defender, dismembered, dispenser, dissenter, distemper, engender, indenture, inventor, November, offender, pretenders, remember, September, surrender
4 Syllables: UUSU
Found 52 words across 3 groupings. Skipped 34 excess words of a similar stem.