2 Syllables: SU
biggest, bigot, billet, biscuit, Bishop, Bridget, Christmas, citrus, dearest, dialect, digest, 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, Whitehead, 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 86 words across 3 groupings. Skipped 20 excess words of a similar stem.