Here's how it's used:
* वर्ण (varna) itself can be used as a noun meaning "color".
* वर्णा (varnaa) is the plural form of "varna", meaning "colors".
Here are some examples:
* फूलों के वर्ण बहुत सुंदर हैं। (Phoolon ke varn bahut sundar hain.) - The colors of the flowers are very beautiful.
* यह चित्र विभिन्न वर्णा में रंगा हुआ है। (Yah chitra vibhinn varnaa mein रंगा hua hai.) - This picture is painted in various colors.