realty vs estate

realty and estate both are nouns.

Word	Noun	Adjective	Verb	Adverb
realty	Yes	No	No	No
estate	Yes	No	No	No

As nouns, estate is a hyponym of realty; that is, estate is a word with a more specific, narrower meaning than realty:

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

Other hyponyms of realty include acres, demesne, land, landed estate, land, dead hand, mortmain.

realty (noun)	estate (noun)
property consisting of houses and land	a major social class or order of persons regarded collectively as part of the body politic of the country (especially in the United Kingdom) and formerly possessing distinct political rights
	extensive landed property (especially in the country) retained by the owner for his own use
	everything you own; all of your assets (whether real property or personal property) and liabilities