chemical science vs polyvalent

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

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

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