acres vs real estate

acres and real estate both are nouns.

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

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

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

Other hypernyms of acres include immovable, real property, realty.

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