2 Syllables: SU
biggest, bigot, billet, biscuit, Bishop, Bridget, Christmas, citrus, dearest, digit, fittest, frigate, grimace, hillock, Iliad, isthmus, limit, listless, millet, minute, minutest, mistress, nearest, Nicholas, nitrous, Philip, pickets, pivot, quibus, richest, rivet, spinach, spirit, syrup, thickets, ticket, tilted, vicious, viscous, wicket, Wilmot
3 Syllables: USU
affiliate, ambitious, Archbishop, assiduous, auspicious, bacillus, capricious, deliberate, delicious, elicits, exhibits, explicit, factitious, fictitious, illicit, implicit, inhibit, judicious, malicious, Narcissus, nutritious, officious, pernicious, prestigious, prodigious, prohibit, propitious, religious, seditious, severest, sincerest, suspicious, utilise
4 Syllables: UUSU
adventitious, avaricious, expeditious, injudicious, irreligious, superstitious, surreptitious, unpropitious, unsuspicious
Found 83 words across 3 groupings. Skipped 17 excess words of a similar stem.