We don't have synonyms for fluxus yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are flexus, fluxes and luxus.
(n) :
An international movement of artists, poets, composers and designers of the 1960s and 1970s, noted for experimental syntheses of different media and disciplines.
(n) :
An international movement of artists, poets, composers and designers of the 1960s and 1970s, noted for experimental syntheses of different media and disciplines.