2 Syllables: SU
biggest, bigot, billet, biscuit, Bishop, Bridget, Christmas, citrus, dearest, digit, fittest, frigate, grimace, hillock, hinted, influx, ingots, isthmus, limit, listless, millet, minute, mistress, nearest, Nicholas, nitrous, Philip, pickets, pivot, printed, quibus, richest, ringlets, rivet, spinach, spirit, Synod, syrup, thickets, ticket, trinkets, vicious, viscous, wicket, Winthrop
3 Syllables: USU
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malicious, Narcissus, nutritious, officious, pernicious, prestigious, prodigious, prohibit, propitious, religious, rescinded, seditious, severest, sincerest, suspicious, utilise
4 Syllables: UUSU
adventitious, avaricious, expeditious, injudicious, irreligious, superstitious, surreptitious, unpropitious, unsuspicious
Found 87 words across 3 groupings. Skipped 19 excess words of a similar stem.