life estate vs estate for life

life estate and estate for life both are nouns.

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

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

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

life estate (noun)	estate for life (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