relativization vs relativisation

relativization and relativisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
relativization	Yes	No	No	No
relativisation	Yes	No	No	No

As nouns, relativization and relativisation are synonyms defined as:

relativization and relativisation: the act or result of making relative or regarding as relative rather than absolute.

relativization (noun)	relativisation (noun)
the act or result of making relative or regarding as relative rather than absolute.	the act or result of making relative or regarding as relative rather than absolute.