fiber bundle vs fasciculus

fiber bundle and fasciculus both are nouns.

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

As nouns, fiber bundle and fasciculus are synonyms defined as:

fiber bundle and fasciculus: a bundle of fibers (especially nerve fibers)

Other synonyms of fiber bundle include fascicle, fibre bundle.

fiber bundle (noun)	fasciculus (noun)
a bundle of fibers (especially nerve fibers)	a bundle of fibers (especially nerve fibers)