real property vs acres

real property and acres both are nouns.

Word	Noun	Adjective	Verb	Adverb
real property	Yes	No	No	No
acres	Yes	No	No	No

As nouns, acres is a hyponym of real property; that is, acres is a word with a more specific, narrower meaning than real property:

real property: property consisting of houses and land
acres: extensive landed property (especially in the country) retained by the owner for his own use

Other hyponyms of real property include demesne, estate, land, landed estate, land, dead hand, mortmain.

real property (noun)	acres (noun)
property consisting of houses and land	extensive landed property (especially in the country) retained by the owner for his own use