cerebral peduncle vs tract

cerebral peduncle and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
cerebral peduncle	Yes	No	No	No
tract	Yes	No	No	No

As nouns, tract is a hypernym of cerebral peduncle; that is, tract is a word with a broader meaning than cerebral peduncle:

cerebral peduncle: a bundle of myelinated neurons joining different parts of the brain
tract: a bundle of myelinated nerve fibers following a path through the brain

Other hypernyms of cerebral peduncle include nerve pathway, nerve tract, pathway.

cerebral peduncle (noun)	tract (noun)
a bundle of myelinated neurons joining different parts of the brain	a bundle of myelinated nerve fibers following a path through the brain
	a system of body parts that together serve some particular purpose
	a brief treatise on a subject of interest; published in the form of a booklet
	an extended area of land