breeding ground vs tract

breeding ground and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
breeding ground	Yes	No	No	No
tract	Yes	No	No	No

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

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

breeding ground (noun)	tract (noun)
a place where animals breed	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