water of hydration vs water of crystallization

water of hydration and water of crystallization both are nouns.

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

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

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

Other synonyms of water of hydration include water of crystallisation.

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