Rice refuse refers to the discarded or leftover parts of the rice plant. There are several synonyms for rice refuse, including rice husks, rice chaff, rice straw, rice bran, and rice hulls. Rice husks are the outermost layer of the rice grain, while rice chaff is the sheath that covers the grain. Rice straw is the stem of the rice plant, while rice bran is the nutrient-rich layer on the inner side of the rice grain. Rice hulls are the protective outer layer of the grain. These synonyms for rice refuse are often used in agriculture, as they can be used for various purposes such as animal feed, fuel, or compost.