pasteurization vs pasteurisation

pasteurization and pasteurisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
pasteurization	Yes	No	No	No
pasteurisation	Yes	No	No	No

As nouns, pasteurization and pasteurisation are synonyms defined as:

pasteurization and pasteurisation: partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food

pasteurization (noun)	pasteurisation (noun)
partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food	partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food