right field vs piece of land

right field and piece of land both are nouns.

Word	Noun	Adjective	Verb	Adverb
right field	Yes	No	No	No
piece of land	Yes	No	No	No

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

Other hypernyms of right field include parcel, parcel of land, piece of ground, tract.

right field (noun)	piece of land (noun)
the fielding position of the player on a baseball team who is expected to field balls in the right third of the outfield (looking from home plate)	an extended area of land
the piece of ground in the outfield on the catcher's right