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, 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malicious, Narcissus, nutritious, officious, pernicious, prestigious, prodigious, prohibit, propitious, religious, rescinded, seditious, severest, sincerest, suspicious, utilise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 88 words across 3 groupings. Skipped 19 excess words of a similar stem.