reorganization vs reorganisation

reorganization and reorganisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
reorganization	Yes	No	No	No
reorganisation	Yes	No	No	No

As nouns, reorganization and reorganisation are synonyms defined as:

reorganization and reorganisation: the imposition of a new organization; organizing differently (often involving extensive and drastic changes)

Other synonyms of reorganization include shake-up, shakeup.

reorganization (noun)	reorganisation (noun)
the imposition of a new organization; organizing differently (often involving extensive and drastic changes)	the imposition of a new organization; organizing differently (often involving extensive and drastic changes)
an extensive alteration of the structure of a corporation or government