Or search: cook, cram, crop, lard, ripe, brace, devil, poise, modify, primed, prompt, flambe, concoct, precook, scallop
2 Syllables: SU
breakfast, chariot, deadliest, dexterous, Eliot, Eliot's, Elliot, Elliott, extras, Harriet, headless, heaviest, lettuce, necklace, nexus, plexus, reckless, redness, sexes, Texas, various, wreckage
3 Syllables: SUU
penniless, readiness
3 Syllables: USU
calcareous, compendious, correctness, directness, gregarious, hilarious, infectious, nefarious, precarious, prospectus, vicarious
4 Syllables: UUSU
commissariat, multifarious, proletariat, Secretariat

Found 39 words across 4 groupings. Skipped 2 excess words of a similar stem.