Or search: peril, behave, evince, threat, imperil, endanger, threaten
1 Syllable: S
Rep
2 Syllables: SU
beverage, hemorrhage, leverage
3 Syllables: SUU
benefice, beverages, blemishes, cherishes, crevices, decorative, emphasis, equipage, heritage, marriages, Meredith, messages, narrative, necklaces, negative, Nemesis, parishes, perishes, prefaces, relative, sedative, terraces, threatenings, vestiges
4 Syllables: USUU
appendages, apprentices, competitive, correlative, imperative, parenthesis, percentages, repetitive
5 Syllables: UUSUU
representative

Found 37 words across 5 groupings. Skipped 6 excess words of a similar stem.