motoneuron vs efferent neuron

motoneuron and efferent neuron both are nouns.

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

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

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

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

motoneuron (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