2 Syllables: SU
biggest, bigot, billet, biscuit, Bishop, Bridget, Christmas, citrus, dearest, digit, fitted, fittest, frigate, grimace, hillock, idiot, isthmus, knitted, limit, liquid, listless, millet, minute, minutest, mistress, nearest, Nicholas, nitrous, Philip, pickets, pitted, pivot, quibus, richest, rivet, spinach, spirit, syrup, thickets, ticket, vicious, viscous, wicked, wicket
3 Syllables: USU
admitted, ambitious, Archbishop, assiduous, auspicious, bacillus, capricious, constricted, convicted, deliberate, delicious, depicted, elicits, emitted, explicit, factitious, fictitious, illicit, implicit, inhibit, insipid, judicious, malicious, Narcissus, nutritious, officious, omitted, permitted, pernicious, predicted, prestigious, prodigious, prohibit, propitious, religious, restricted, seditious, severest, sincerest, submitted, suspicious, transmitted, utilise
4 Syllables: UUSU
adventitious, avaricious, contradicted, expeditious, injudicious, irreligious, superstitious, surreptitious, unpropitious, unsuspicious
Found 97 words across 3 groupings. Skipped 20 excess words of a similar stem.