tract vs peduncle

tract and peduncle both are nouns.

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

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

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 tract include optic radiation, radiatio optica, commissure, cerebral peduncle.

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
a system of body parts that together serve some particular purpose	stalk bearing an inflorescence or solitary flower
a brief treatise on a subject of interest; published in the form of a booklet	the thin process of tissue that attaches a polyp to the body
an extended area of land