Crown land vs acres

Crown land and acres both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crown land	Yes	No	No	No
acres	Yes	No	No	No

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

Crown land: land that belongs to the Crown
acres: extensive landed property (especially in the country) retained by the owner for his own use

Other hypernyms of Crown land include demesne, estate, land, landed estate.

Crown land (noun)	acres (noun)
land that belongs to the Crown	extensive landed property (especially in the country) retained by the owner for his own use