optic radiation vs tract

optic radiation and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
optic radiation	Yes	No	No	No
tract	Yes	No	No	No

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

optic radiation: a nerve pathway from the lateral geniculate body to the visual cortex
tract: a bundle of myelinated nerve fibers following a path through the brain

Other hypernyms of optic radiation include nerve pathway, nerve tract, pathway.

optic radiation (noun)	tract (noun)
a nerve pathway from the lateral geniculate body to the visual cortex	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