Muskrat fur is a highly prized fur for its softness, durability and warmth, and it has been used for centuries in clothing and accessories. There are various synonyms for muskrat fur, such as rat fur, musquash fur, and water rat fur. Rat fur, though it sounds unpleasant, is actually a common term used in the fur trade. Musquash fur is another alternative for muskrat, as it is another name for the animal that produces the fur. Lastly, water rat fur is another term for muskrat fur, as it is an aquatic rodent that has a thick coat of warm fur that is used to keep it waterproof in its marshy habitat.