2 Syllables: SU
blurring, blushing, brushing, bubbling, budding, bustling, buzzing, chuckling, clutching, coming, coupling, covering, crushing, Cummings, cunning, cutting, doubling, drumming, Dublin, ducking, during, dusting, flooding, flushing, grudging, gushing, hovering, hugging, humming, judging, juggling, Justin, jutting, loving, Muslim, nothings, plucking, plugging, plumbing, puffing, putting, puzzling, rubbing, running, rushing, Ruskin, rusting, rustling, scrubbing, shoving, shrugging, shuffling, shunning, shutting, smuggling, spurring, stirring, struggling, strutting, stuffing, stunning, sucking, suckling, suffering, summing, thrusting, touching, troubling, trudging, trusting, tugging
3 Syllables: USU
adjusting, becoming, concurring, conferring, deferring, discussing, disgusting, entrusting, forthcoming, incurring, inferring, occurring, preferring, recurring, referring, succumbing, transferring
4 Syllables: UUSU
Found 89 words across 3 groupings. Skipped 5 excess words of a similar stem.