yard vs piece of ground

yard and piece of ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
yard	Yes	No	No	No
piece of ground	Yes	No	No	No

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

yard: an area having a network of railway tracks and sidings for storage and maintenance of cars and engines
piece of ground: an extended area of land

Other hypernyms of yard include parcel, parcel of land, piece of land, tract.

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

yard: a tract of land enclosed for particular activities (sometimes paved and usually associated with buildings)
piece of ground: an extended area of land

Other hypernyms of yard include parcel, parcel of land, piece of land, tract.

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

Other hypernyms of yard include parcel, parcel of land, piece of land, tract.

yard (noun)	piece of ground (noun)
an enclosure for animals (as chicken or livestock)	an extended area of land
a long horizontal spar tapered at the end and used to support and spread a square sail or lateen
the enclosed land around a house or other building
an area having a network of railway tracks and sidings for storage and maintenance of cars and engines
a tract of land enclosed for particular activities (sometimes paved and usually associated with buildings)
a tract of land where logs are accumulated
a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride
a unit of volume (as for sand or gravel)
the cardinal number that is the product of 10 and 100