We don't have synonyms for douma yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are dogma, doura and duma.
(n) :
Archaic form of duma (“Russian legislative assembly”). [A Russian legislative assembly such as the historical duma of the Russian Empire or the modern lower house of the Federal Assembly (the Russian national parliament).]
(n) :
Archaic form of duma (“Russian legislative assembly”). [A Russian legislative assembly such as the historical duma of the Russian Empire or the modern lower house of the Federal Assembly (the Russian national parliament).]