estate for life vs life estate

estate for life and life estate both are nouns.

Word	Noun	Adjective	Verb	Adverb
estate for life	Yes	No	No	No
life estate	Yes	No	No	No

As nouns, estate for life and life estate are synonyms defined as:

estate for life and life estate: (law) an estate whose duration is limited to the life of the person holding it

estate for life (noun)	life estate (noun)
(law) an estate whose duration is limited to the life of the person holding it	(law) an estate whose duration is limited to the life of the person holding it