We don't have synonyms for carta yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cart, carte and caria.
(n) :
Ellipsis of Magna Carta. [(historical) A charter granted by King John to the barons at Runnymede in 1215, which is one of the bases of English constitutional tradition; a physical copy of this charter, or a later version.]
(n) :
Ellipsis of Magna Carta. [(historical) A charter granted by King John to the barons at Runnymede in 1215, which is one of the bases of English constitutional tradition; a physical copy of this charter, or a later version.]