colonisation vs colonization

colonisation and colonization both are nouns.

Word	Noun	Adjective	Verb	Adverb
colonisation	Yes	No	No	No
colonization	Yes	No	No	No

As nouns, colonisation and colonization are synonyms defined as:

colonisation and colonization: the act of colonizing; the establishment of colonies

Other synonyms of colonisation include settlement.

colonisation (noun)	colonization (noun)
the act of colonizing; the establishment of colonies	the act of colonizing; the establishment of colonies