water of crystallisation vs water of crystallization

water of crystallisation and water of crystallization both are nouns.

Word	Noun	Adjective	Verb	Adverb
water of crystallisation	Yes	No	No	No
water of crystallization	Yes	No	No	No

As nouns, water of crystallisation and water of crystallization are synonyms defined as:

water of crystallisation and water of crystallization: the water present in hydrated compounds

Other synonyms of water of crystallisation include water of hydration.

water of crystallisation (noun)	water of crystallization (noun)
the water present in hydrated compounds	the water present in hydrated compounds