We don't have synonyms for perennialism yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are perenniality and perennials.
(n) :
(education) A normative educational philosophy according to which one should teach the things that are of everlasting relevance to all people everywhere, and that the emphasis should be on principles, not facts.
(n) :
(education) A normative educational philosophy according to which one should teach the things that are of everlasting relevance to all people everywhere, and that the emphasis should be on principles, not facts.