randomization vs randomisation

randomization and randomisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
randomization	Yes	No	No	No
randomisation	Yes	No	No	No

As nouns, randomization and randomisation are synonyms defined as:

randomization and randomisation: a deliberately haphazard arrangement of observations so as to simulate chance

randomization (noun)	randomisation (noun)
a deliberately haphazard arrangement of observations so as to simulate chance	a deliberately haphazard arrangement of observations so as to simulate chance