mortmain vs real estate

mortmain and real estate both are nouns.

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

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

mortmain: real property held inalienably (as by an ecclesiastical corporation)
real estate: property consisting of houses and land

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

mortmain (noun)	real estate (noun)
the oppressive influence of past events or decisions	property consisting of houses and land
real property held inalienably (as by an ecclesiastical corporation)