Hindi words can either be masculine or feminine. There is no neutral gender in Hindi.
Hindi words those ending in "आ " (aa) are masculine.
For example - Room - कमरा Kamaraa
Since "कमरा" kamaraa ends in आ "aa" sound that's why it is a masculine word in Hindi.
The plural form of Masculine nouns ending in आ “aa” are made by changing the final आ “aa” into ए “e”
कमरा Kamaraa Room कमरे Kamare Rooms