miniaturisation vs miniaturization

miniaturisation and miniaturization both are nouns.

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

As nouns, miniaturisation and miniaturization are synonyms defined as:

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

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