It's important to note that "kamal" can refer to both the water lily and the lotus flower, which are both visually similar. To be more specific, you could say:
* सफेद कमल (Safed Kamal) for white lily
* गुलाबी कमल (Gulabi Kamal) for pink lily
* पीला कमल (Peela Kamal) for yellow lily
There are other words for lily in Hindi, but "Kamal" is the most common and widely understood.