devitalisation vs devitalization

devitalisation and devitalization both are nouns.

Word	Noun	Adjective	Verb	Adverb
devitalisation	Yes	No	No	No
devitalization	Yes	No	No	No

As nouns, devitalisation and devitalization are synonyms defined as:

devitalisation and devitalization: the act of reducing the vitality of something

devitalisation (noun)	devitalization (noun)
the act of reducing the vitality of something	the act of reducing the vitality of something