decentralisation vs spreading

decentralisation and spreading both are nouns.

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

As nouns, spreading is a hypernym of decentralisation; that is, spreading is a word with a broader meaning than decentralisation:

decentralisation: the spread of power away from the center to local branches or governments
spreading: act of extending over a wider scope or expanse of space or time

Other hypernyms of decentralisation include spread.

decentralisation (noun)	spreading (noun)
the spread of power away from the center to local branches or governments	act of extending over a wider scope or expanse of space or time
	the opening of a subject to widespread discussion and debate
	process or result of distributing or extending over a wide expanse of space