efferent nerve vs nervus

efferent nerve and nervus both are nouns.

Word	Noun	Adjective	Verb	Adverb
efferent nerve	Yes	No	No	No
nervus	Yes	No	No	No

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

efferent nerve: a nerve that conveys impulses toward or to muscles or glands
nervus: any bundle of nerve fibers running to various organs and tissues of the body

Other hypernyms of efferent nerve include nerve.

efferent nerve (noun)	nervus (noun)
a nerve that conveys impulses toward or to muscles or glands	any bundle of nerve fibers running to various organs and tissues of the body