We don't have synonyms for epideictical yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are epidictical, epideictic and apodeictical.
(adj) :
Alternative form of epideictic. [Of or pertaining to rhetoric of ceremony, declamation, and demonstration, most often the rhetoric of funerals and other formal events. One of the three branches, or "species" (eidē), of rhetoric as outlined by Aristotle.]
(adj) :
Alternative form of epideictic. [Of or pertaining to rhetoric of ceremony, declamation, and demonstration, most often the rhetoric of funerals and other formal events. One of the three branches, or "species" (eidē), of rhetoric as outlined by Aristotle.]