moisturize vs hydrate

moisturize is not a noun while hydrate is a noun.

Word	Noun	Adjective	Verb	Adverb
moisturize	No	No	Yes	No
hydrate	Yes	No	Yes	No

As verbs, hydrate is a hyponym of moisturize; that is, hydrate is a word with a more specific, narrower meaning than moisturize:

moisturize (noun)	hydrate (noun)
	any compound that contains water of crystallization

moisturize (verb)	hydrate (verb)
make (more) humid	cause to be hydrated; add water or moisture to
	become hydrated and combine with water
	supply water or liquid to in order to maintain a healthy balance