efferent neuron vs motor nerve fiber

efferent neuron and motor nerve fiber both are nouns.

Word	Noun	Adjective	Verb	Adverb
efferent neuron	Yes	No	No	No
motor nerve fiber	Yes	No	No	No

As nouns, efferent neuron and motor nerve fiber are synonyms defined as:

efferent neuron and motor nerve fiber: a neuron conducting impulses outwards from the brain or spinal cord

Other synonyms of efferent neuron include motoneuron, motor neuron.

efferent neuron (noun)	motor nerve fiber (noun)
a neuron conducting impulses outwards from the brain or spinal cord	a neuron conducting impulses outwards from the brain or spinal cord