decentralization vs decentralisation

decentralization and decentralisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
decentralization	Yes	No	No	No
decentralisation	Yes	No	No	No

As nouns, decentralization and decentralisation are synonyms defined as:

decentralization and decentralisation: the spread of power away from the center to local branches or governments

decentralization (noun)	decentralisation (noun)
the spread of power away from the center to local branches or governments	the spread of power away from the center to local branches or governments
the social process in which population and industry moves from urban centers to outlying districts