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3 Syllables: SUU
dualism, nihilism
4 Syllables: SUUU
fatalism, federalism, feudalism, formalism, journalism, naturalism, pluralism, socialism, syllogism, symbolism, vandalism
5 Syllables: USUUU
colonialism, empiricism, imperialism, industrialism, materialism, metabolism, paternalism, provincialism
6 Syllables: UUSUUU
sentimentalism
6 Syllables: UUUSUU
individualism

Found 23 words across 5 groupings.