Water lilies are a type of aquatic plant that belongs to the family Nymphaeaceae. They are also known as LOTUS, which is the 5-letter solution to the crossword, and nenuphar or nuphar, which are the 6- and 8-letter solutions respectively. Water lilies are known for their large, round leaves and beautiful flowers that float on the surface of the water. They are often found in ponds, lakes, and slow-moving streams.