nerve tract vs peduncle

nerve tract and peduncle both are nouns.

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

As nouns, peduncle is a hyponym of nerve tract; that is, peduncle is a word with a more specific, narrower meaning than nerve tract:

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

Other hyponyms of nerve tract include optic radiation, radiatio optica, commissure, cerebral peduncle.

nerve tract (noun)	peduncle (noun)
a bundle of myelinated nerve fibers following a path through the brain	a bundle of myelinated neurons joining different parts of the brain
	stalk bearing an inflorescence or solitary flower
	the thin process of tissue that attaches a polyp to the body