miniaturization vs miniaturisation

miniaturization and miniaturisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
miniaturization	Yes	No	No	No
miniaturisation	Yes	No	No	No

As nouns, miniaturization and miniaturisation are synonyms defined as:

miniaturization and miniaturisation: act of making on a greatly reduced scale

miniaturization (noun)	miniaturisation (noun)
act of making on a greatly reduced scale	act of making on a greatly reduced scale