We don't have synonyms for roubles yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are doubles, rouble and troubles.
(n) :
Alternative spelling of ruble. [The monetary unit of Russia, Belarus and Transnistria, equal to 100 kopeks. (Russian: копе́йка (kopéjka), Belarusian: капе́йка (kapjéjka)).]
(n) :
Alternative spelling of ruble. [The monetary unit of Russia, Belarus and Transnistria, equal to 100 kopeks. (Russian: копе́йка (kopéjka), Belarusian: капе́йка (kapjéjka)).]