countryseat vs acres

countryseat and acres both are nouns.

Word	Noun	Adjective	Verb	Adverb
countryseat	Yes	No	No	No
acres	Yes	No	No	No

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

countryseat: an estate in the country
acres: extensive landed property (especially in the country) retained by the owner for his own use

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

countryseat (noun)	acres (noun)
an estate in the country	extensive landed property (especially in the country) retained by the owner for his own use