countryseat vs landed estate

countryseat and landed estate both are nouns.

Word	Noun	Adjective	Verb	Adverb
countryseat	Yes	No	No	No
landed estate	Yes	No	No	No

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

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

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

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