cerebral peduncle vs pathway

cerebral peduncle and pathway both are nouns.

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

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

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

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

cerebral peduncle (noun)	pathway (noun)
a bundle of myelinated neurons joining different parts of the brain	a trodden path
	a bundle of myelinated nerve fibers following a path through the brain