There are many different synonyms for the term "natural fiber." Natural fibers refer to any material that is derived from plant or animal sources, and which has not been chemically altered in any way. Some common synonyms for natural fibers include organic materials, plant-based materials, and sustainable fibers. Other terms that may be used include eco-friendly materials, biodegradable fibers, and environmentally-friendly fabrics. No matter which term is used, however, the idea is the same - natural fibers are a great choice for anyone looking for high-quality, organic materials that are both durable and environmentally-friendly.