fossilisation vs fossilization

fossilisation and fossilization both are nouns.

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

As nouns, fossilisation and fossilization are synonyms defined as:

As nouns, fossilisation and fossilization are synonyms defined as:

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

fossilisation (noun)	fossilization (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becoming inflexible or out of date	becoming inflexible or out of date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