anterior horn vs efferent nerve

anterior horn and efferent nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
anterior horn	Yes	No	No	No
efferent nerve	Yes	No	No	No

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

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

Other hypernyms of anterior horn include efferent, motor nerve.

anterior horn (noun)	efferent 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