fibre bundle vs nervus

fibre bundle and nervus both are nouns.

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

As nouns, nervus is a hyponym of fibre bundle; that is, nervus is a word with a more specific, narrower meaning than fibre bundle:

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

Other hyponyms of fibre bundle include fornix, trigonum cerebrale, nerve.

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