dissociation vs separation

dissociation and separation both are nouns.

Word	Noun	Adjective	Verb	Adverb
dissociation	Yes	No	No	No
separation	Yes	No	No	No

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

dissociation (noun)	separation (noun)
the act of removing from association	the social act of separating or parting company
(chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions	the act of dividing or disconnecting
a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently	(law) the cessation of cohabitation of man and wife (either by mutual agreement or under a court order)
	sorting one thing from others
	the distance between things
	coming apart
	the termination of employment (by resignation or dismissal)
	the space where a division or parting occurs
	the state of lacking unity