polyvalent vs chemical science

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

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

polyvalent (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

polyvalent (adjective)	chemical science (adjective)
having more than one valence, or having a valence of 3 or higher
containing several antibodies each capable of counteracting a specific antigen