legal separation vs surcease

legal separation and surcease both are nouns.

Word	Noun	Adjective	Verb	Adverb
legal separation	Yes	No	No	No
surcease	Yes	No	No	No

As nouns, surcease is a hypernym of legal separation; that is, surcease is a word with a broader meaning than legal separation:

legal separation: (law) the cessation of cohabitation of man and wife (either by mutual agreement or under a court order)
surcease: a stopping

Other hypernyms of legal separation include cessation.

legal separation (noun)	surcease (noun)
(law) the cessation of cohabitation of man and wife (either by mutual agreement or under a court order)	a stopping
a judicial decree regulating the rights and responsibilities of a married couple living apart