bivalent vs chemistry

bivalent is not a noun while chemistry is a noun.

Word	Noun	Adjective	Verb	Adverb
bivalent	No	Yes	No	No
chemistry	Yes	No	No	No

bivalent (noun)	chemistry (noun)
	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
	the way two individuals relate to each other
	the chemical composition and properties of a substance or object

bivalent (adjective)	chemistry (adjective)
used of homologous chromosomes associated in pairs in synapsis
having a valence of two or having two valences