park vs piece of land

park and piece of land both are nouns.

Word	Noun	Adjective	Verb	Adverb
park	Yes	No	Yes	No
piece of land	Yes	No	No	No

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

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

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

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

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

park (noun)	piece of land (noun)
a facility in which ball games are played (especially baseball games)	an extended area of land
a gear position that acts as a parking brake
a large area of land preserved in its natural state as public property
a piece of open land for recreational use in an urban area
a lot where cars are parked

park (verb)	piece of land (verb)
place temporarily
maneuver a vehicle into a parking space