multivalency vs multivalence

multivalency and multivalence both are nouns.

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

As nouns, multivalency and multivalence are synonyms defined as:

multivalency and multivalence: (chemistry) the state of having a valence greater than two

Other synonyms of multivalency include polyvalence, polyvalency.

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