self-organisation vs self-organization

self-organisation and self-organization both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-organisation	Yes	No	No	No
self-organization	Yes	No	No	No

As nouns, self-organisation and self-organization are synonyms defined as:

self-organisation and self-organization: organizing yourself (especially organizing your own labor union)

self-organisation (noun)	self-organization (noun)
organizing yourself (especially organizing your own labor union)	organizing yourself (especially organizing your own labor union)