chemical science vs hydrous

chemical science is a noun but hydrous is not a noun.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
hydrous	No	Yes	No	No

chemical science (noun)	hydrous (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

chemical science (adjective)	hydrous (adjective)
	containing combined water (especially water of crystallization as in a hydrate)