motor neuron vs efferent neuron

motor neuron and efferent neuron both are nouns.

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

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

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

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

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