alphabetization vs alphabetisation

alphabetization and alphabetisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
alphabetization	Yes	No	No	No
alphabetisation	Yes	No	No	No

As nouns, alphabetization and alphabetisation are synonyms defined as:

alphabetization and alphabetisation: the act of putting in alphabetical order

alphabetization (noun)	alphabetisation (noun)
the act of putting in alphabetical order	the act of putting in alphabetical order