fossilization vs fossilisation

fossilization and fossilisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
fossilization	Yes	No	No	No
fossilisation	Yes	No	No	No

As nouns, fossilization and fossilisation are synonyms defined as:

As nouns, fossilization and fossilisation are synonyms defined as:

fossilization and fossilisation: the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone

fossilization (noun)	fossilisation (noun)
becoming inflexible or out of date	becoming inflexible or out of date
the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone	the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone