nervus vs fascicle

nervus and fascicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
nervus	Yes	No	No	No
fascicle	Yes	No	No	No

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

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

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

nervus (noun)	fascicle (noun)
any bundle of nerve fibers running to various organs and tissues of the body	a bundle of fibers (especially nerve fibers)
	an installment of a printed work