Or search: mate, hubby, spouse, partner, benedick, benedict, conserve, retrench, economize, economise, househusband
2 Syllables: SU
cousin, Covent, custom, dozen, Dutchman, husband, husband's, judgement, judgment, Justin, Muslim, muslin, oven, Prussian, roughened, ruffian, Russian, Tuscan
3 Syllables: USU
accustom, adjustment, Augustan, combustion, concussion, discussion, escutcheon, Etruscan, percussion, readjustment
4 Syllables: UUSU
repercussions, unaccustomed

Found 30 words across 3 groupings. Skipped 14 excess words of a similar stem.