We don't have synonyms for sicca yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nicca, wicca and cicca.
(n) :
Ellipsis of sicca rupee. [(now historical) A newly-minted rupee, having a higher value than those in long use; later (specifically), a rupee coined by the Bengal Government from 1793.]
(n) :
Ellipsis of sicca rupee. [(now historical) A newly-minted rupee, having a higher value than those in long use; later (specifically), a rupee coined by the Bengal Government from 1793.]