multivalency vs multivalent

multivalency is a noun but multivalent is not a noun.

Word	Noun	Adjective	Verb	Adverb
multivalency	Yes	No	No	No
multivalent	No	Yes	No	No

multivalency (noun)	multivalent (noun)
(chemistry) the state of having a valence greater than two

multivalency (adjective)	multivalent (adjective)
	used of the association of three or more homologous chromosomes during the first division of meiosis
	having more than one valence, or having a valence of 3 or higher
	having many values, meanings, or appeals