legal separation vs cessation

legal separation and cessation both are nouns.

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

As nouns, cessation is a hypernym of legal separation; that is, cessation 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)
cessation: a stopping

Other hypernyms of legal separation include surcease.

legal separation (noun)	cessation (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