ruggedization vs ruggedisation

ruggedization and ruggedisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruggedization	Yes	No	No	No
ruggedisation	Yes	No	No	No

As nouns, ruggedization and ruggedisation are synonyms defined as:

ruggedization and ruggedisation: the act of making a piece of equipment rugged (strengthening to resist wear or abuse)

ruggedization (noun)	ruggedisation (noun)
the act of making a piece of equipment rugged (strengthening to resist wear or abuse)	the act of making a piece of equipment rugged (strengthening to resist wear or abuse)