We don't have synonyms for pantacle yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pinnacle, particle and panache.
(n) :
(rare) Alternative spelling of pentacle, used by A. E. Waite and probably also some other members of the Hermetic Order of the Golden Dawn, and then by Aleister Crowley. [A flat talisman, almost always star-shaped, made of parchment, sheet metal, or other substance, marked with a magic symbol or symbols, used in magical evocation.]
(n) :
(rare) Alternative spelling of pentacle, used by A. E. Waite and probably also some other members of the Hermetic Order of the Golden Dawn, and then by Aleister Crowley. [A flat talisman, almost always star-shaped, made of parchment, sheet metal, or other substance, marked with a magic symbol or symbols, used in magical evocation.]