fasciculus vs fiber bundle

fasciculus and fiber bundle both are nouns.

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

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

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

Other synonyms of fasciculus include fascicle, fibre bundle.

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