2 Syllables: SU
blushing, brushing, bustling, buzzing, clutching, covering, crushing, dusting, flushing, grudging, gushing, hovering, judging, Justin, loving, Muslim, nothing, puffing, puzzling, rushing, Ruskin, rusting, rustling, shoving, shuffling, stuffing, suffering, thrusting, touching, trudging, trusting
3 Syllables: USU
adjusting, conducting, constructing, corrupting, deducting, discussing, disgusting, disrupting, entrusting, instructing, obstructing
4 Syllables: UUSU
Found 44 words across 3 groupings. Skipped 3 excess words of a similar stem.