fiber bundle vs nerve

fiber bundle and nerve both are nouns.

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

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

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

Other hyponyms of fiber bundle include fornix, trigonum cerebrale, nervus.

fiber bundle (noun)	nerve (noun)
a bundle of fibers (especially nerve fibers)	the courage to carry on
	impudent aggressiveness
	any bundle of nerve fibers running to various organs and tissues of the body

fiber bundle (verb)	nerve (verb)
	get ready for something difficult or unpleasant