2 Syllables: SU
bristling, christening, crippling, differing, giggling, glistening, listening, middling, nibbling, rippling, scribbling, sickening, stiffening, thickening
3 Syllables: SUU
bickering, blistering, dissident, figuring, flickering, glimmering, glittering, glycerine, grimaces, limiting, mistresses, Pickering, picturing, primitive, pyramids, quickening, quivering, rivalling, shimmering, shivering, simmering, synonym, tickling, villages, whispering, withering, wriggling
4 Syllables: USUU
conditioning, considering, deliberative, delivering, derivative, eliciting, Elisabeth, Elizabeth, imprisoning, indicative, inhibiting, initiative, petitioning, positioning, prohibiting, prohibitive, soliciting
Found 58 words across 3 groupings. Skipped 3 excess words of a similar stem.