parkland vs parcel of land

parkland and parcel of land both are nouns.

Word	Noun	Adjective	Verb	Adverb
parkland	Yes	No	No	No
parcel of land	Yes	No	No	No

As nouns, parcel of land is a hypernym of parkland; that is, parcel of land is a word with a broader meaning than parkland:

parkland: a large area of land preserved in its natural state as public property
parcel of land: an extended area of land

Other hypernyms of parkland include parcel, piece of ground, piece of land, tract.

parkland (noun)	parcel of land (noun)
a large area of land preserved in its natural state as public property	an extended area of land