2 Syllables: SU
blurring, blushing, brushing, bubbling, budding, bumping, bungling, bunting, bustling, buzzing, chuckling, clutching, coming, coupling, covering, crumbling, crushing, Cummings, cunning, cutting, doubling, drumming, Dublin, ducking, dumping, during, dusting, flooding, flushing, fronting, fumbling, funding, grudging, grumbling, grunting, gushing, hovering, hugging, humbling, humming, hunting, judging, juggling, jumping, Justin, jutting, loving, mumbling, nothing, plucking, plugging, plumbing, plunging, puffing, pumping, pumpkin, punching, putting, rubbing, rumbling, running, rushing, Ruskin, rusting, rustling, scrubbing, shoving, shrugging, shuffling, shunning, shutting, smuggling, something, spurring, stirring, struggling, strutting, stuffing, stumbling, stunning, sucking, suckling, suffering, summing, thrusting, thumping, touching, troubling, trudging, trusting, tugging
3 Syllables: USU
adjusting, becoming, concurring, conferring, confronting, deferring, discussing, disgusting, entrusting, forthcoming, incurring, inferring, occurring, preferring, recurring, referring, succumbing, transferring
4 Syllables: UUSU
Found 110 words across 3 groupings. Skipped 5 excess words of a similar stem.