We don't have synonyms for holographs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are holograph, holographic and bolograph.
(n) :
(law, textual criticism) A handwritten document that is solely the work of the person whose signature it bears, especially a letter, deed, or will; an original manuscript, a protograph.
(n) :
(law, textual criticism) A handwritten document that is solely the work of the person whose signature it bears, especially a letter, deed, or will; an original manuscript, a protograph.