pasteurisation vs pasteurization

pasteurisation and pasteurization both are nouns.

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

As nouns, pasteurisation and pasteurization are synonyms defined as:

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

pasteurisation (noun)	pasteurization (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