Or search: merge, unite, federate, federalise, decentralize, decentralise, deconcentrate
3 Syllables: SUU
clarifies, generalized, mechanized, memorize, paradigms, paralyze, specialised, specialize, specifies, sterilized
4 Syllables: SUUU
generalised, generalize
4 Syllables: USUU
electrolyte

Found 13 words across 3 groupings. Skipped 3 excess words of a similar stem.