anterior root vs motor nerve

anterior root and motor nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
anterior root	Yes	No	No	No
motor nerve	Yes	No	No	No

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

anterior root: 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 anterior root include efferent, efferent nerve.

anterior root (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