hydrous vs chemical science

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

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

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

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