Organic materials are those that come from living beings or organisms, such as plants or animals. There are several synonyms for the term "organic materials," including natural substances, biodegradable materials, plant-based materials, and renewable resources. "Natural substances" refers to materials that are found in nature and have not been extensively chemically altered, while "biodegradable materials" are substances that can decompose naturally over time. "Plant-based materials" specifically refers to materials derived from plants, while "renewable resources" are materials that can be replenished over time and are not finite. All of these terms encompass the idea of using materials that are environmentally friendly and sustainable.