nervus vs fiber bundle

nervus and fiber bundle both are nouns.

Word	Noun	Adjective	Verb	Adverb
nervus	Yes	No	No	No
fiber bundle	Yes	No	No	No

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

nervus: any bundle of nerve fibers running to various organs and tissues of the body
fiber bundle: a bundle of fibers (especially nerve fibers)

Other hypernyms of nervus include fascicle, fasciculus, fibre bundle.

nervus (noun)	fiber bundle (noun)
any bundle of nerve fibers running to various organs and tissues of the body	a bundle of fibers (especially nerve fibers)