demonetization vs demonetisation

demonetization and demonetisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
demonetization	Yes	No	No	No
demonetisation	Yes	No	No	No

As nouns, demonetization and demonetisation are synonyms defined as:

demonetization and demonetisation: ending something (e.g. gold or silver) as no longer the legal tender of a country

demonetization (noun)	demonetisation (noun)
ending something (e.g. gold or silver) as no longer the legal tender of a country	ending something (e.g. gold or silver) as no longer the legal tender of a country