dead hand vs mortmain

dead hand and mortmain both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead hand	Yes	No	No	No
mortmain	Yes	No	No	No

As nouns, dead hand and mortmain are synonyms defined as:

dead hand and mortmain: the oppressive influence of past events or decisions

Other synonyms of dead hand include dead hand of the past.

As nouns, dead hand and mortmain are synonyms defined as:

dead hand and mortmain: real property held inalienably (as by an ecclesiastical corporation)

dead hand (noun)	mortmain (noun)
the oppressive influence of past events or decisions	the oppressive influence of past events or decisions
real property held inalienably (as by an ecclesiastical corporation)	real property held inalienably (as by an ecclesiastical corporation)