clearing vs piece of ground

clearing and piece of ground both are nouns.

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

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

clearing: a tract of land with few or no trees in the middle of a wooded area
piece of ground: an extended area of land

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

clearing (noun)	piece of ground (noun)
the act of freeing from suspicion	an extended area of land
the act of removing solid particles from a liquid
a tract of land with few or no trees in the middle of a wooded area