polyvalence vs multivalency

polyvalence and multivalency both are nouns.

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

As nouns, polyvalence and multivalency are synonyms defined as:

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

Other synonyms of polyvalence include multivalence, polyvalency.

polyvalence (noun)	multivalency (noun)
(chemistry) the state of having a valence greater than two	(chemistry) the state of having a valence greater than two
(toxicology) the state of being capable of counteracting more than one toxin or antigen or kind of microorganism