picnic area vs tract

picnic area and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
picnic area	Yes	No	No	No
tract	Yes	No	No	No

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

Other hypernyms of picnic area include parcel, parcel of land, piece of ground, piece of land.

picnic area (noun)	tract (noun)
a tract of land set aside for picnicking	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