chemical science vs univalent

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

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

chemical science (noun)	univalent (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)	univalent (adjective)
	used of a chromosome that is not paired or united with its homologous chromosome during synapsis
	having a valence of 1