motoneuron vs motor neuron

motoneuron and motor neuron both are nouns.

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

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

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

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

motoneuron (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