2 Syllables: SU
breakfasts, chestnut, deadliest, dexterous, exit, extras, headless, lettuce, necklace, nexus, plexus, readiest, reckless, redness, sexes, Texas, wreckage
3 Syllables: USU
Found 21 words across 2 groupings. Skipped 1 excess word of a similar stem.