center field vs tract

center field and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
center field	Yes	No	No	No
tract	Yes	No	No	No

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

center field: the piece of ground in the outfield directly ahead of the catcher
tract: an extended area of land

Other hypernyms of center field include parcel, parcel of land, piece of ground, piece of land.

center field (noun)	tract (noun)
the fielding position of the player on a baseball team who is expected to field balls in the central third of the outfield	a bundle of myelinated nerve fibers following a path through the brain
the piece of ground in the outfield directly ahead of the catcher	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