Which among the following words does not belong in the same group as others?

In this question, Leone is the currency unit of Sierra Leone. Dirham is a currency unit in several countries such as Kuwait, Libya, Morocco, Qatar, Tunisia and UAE. Baht is a currency unit of Thailand. Lempira is a basic unit of money in Honduras. Thus each of them are currencies, while Duma is the lower house of the Russian Federal Assembly. The upper house there is called Federal Council. Hence, the answer is Duma.