valence vs bivalent

valence is a noun but bivalent is not a noun.

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

valence (noun)	bivalent (noun)
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate

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