We don't have synonyms for psychism yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are psychic, schism and psychics.
(n) :
(philosophy) The old doctrine that there is a fluid (continuity) universally diffusing, and equally animating all living beings, the difference in their actions being due to the difference of the individual organizations.
(n) :
(philosophy) The old doctrine that there is a fluid (continuity) universally diffusing, and equally animating all living beings, the difference in their actions being due to the difference of the individual organizations.