site vs piece of ground

site and piece of ground both are nouns.

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

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

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

site (noun)	piece of ground (noun)
a computer connected to the internet that maintains a series of web pages on the World Wide Web; a computer connected to the internet that maintains a series of web pages on the World Wide Web	an extended area of land
the piece of land on which something is located (or is to be located)
physical position in relation to the surroundings

site (verb)	piece of ground (verb)
assign a location to