Are effernet nerve fibers described as motor fibers?

No, efferent nerve fibers are not described as motor fibers. Efferent nerve fibers carry signals away from the central nervous system (CNS) to the peripheral nervous system (PNS) and effectors such as muscles and glands. Motor fibers are a specific type of efferent nerve fibers that transmit signals from the CNS to muscles to cause muscle contractions. Therefore, efferent nerve fibers are a broader category that includes motor fibers.