decentralisation vs decentralization

decentralisation and decentralization both are nouns.

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

As nouns, decentralisation and decentralization are synonyms defined as:

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

decentralisation (noun)	decentralization (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