oasis vs tract

oasis and tract both are nouns.

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

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

oasis: a fertile tract in a desert (where the water table approaches the surface)
tract: an extended area of land

Other hypernyms of oasis include parcel, parcel of land, piece of ground, piece of land.

oasis (noun)	tract (noun)
a shelter serving as a place of safety or sanctuary	a bundle of myelinated nerve fibers following a path through the brain
a fertile tract in a desert (where the water table approaches the surface)	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