ventral horn vs motor nerve

ventral horn and motor nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
ventral horn	Yes	No	No	No
motor nerve	Yes	No	No	No

As nouns, motor nerve is a hypernym of ventral horn; that is, motor nerve is a word with a broader meaning than ventral horn:

ventral horn: one of the two roots of a spinal nerve that passes ventrally from the spinal cord and that consists of motor fibers
motor nerve: a nerve that conveys impulses toward or to muscles or glands

Other hypernyms of ventral horn include efferent, efferent nerve.

ventral horn (noun)	motor nerve (noun)
one of the two roots of a spinal nerve that passes ventrally from the spinal cord and that consists of motor fibers	a nerve that conveys impulses toward or to muscles or glands