commons vs piece of land

commons and piece of land both are nouns.

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

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

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

commons (noun)	piece of land (noun)
a class composed of persons lacking clerical or noble rank	an extended area of land
a piece of open land for recreational use in an urban area
a pasture subject to common use