motor nerve fiber vs motor neuron

motor nerve fiber and motor neuron both are nouns.

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

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

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

Other synonyms of motor nerve fiber include efferent neuron, motoneuron.

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