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, minute's, minutest, 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malicious, Narcissus, nutritious, officious, pernicious, prestigious, prodigious, prohibit, propitious, religious, rescinded, seditious, severest, sincerest, suspicious, utilise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 89 words across 3 groupings. Skipped 17 excess words of a similar stem.