Westernization vs Westernisation

Westernization and Westernisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Westernization	Yes	No	No	No
Westernisation	Yes	No	No	No

As nouns, Westernization and Westernisation are synonyms defined as:

Westernization and Westernisation: assimilation of Western culture; the social process of becoming familiar with or converting to the customs and practices of Western civilization

Westernization (noun)	Westernisation (noun)
assimilation of Western culture; the social process of becoming familiar with or converting to the customs and practices of Western civilization	assimilation of Western culture; the social process of becoming familiar with or converting to the customs and practices of Western civilization