polyvalency vs multivalency

polyvalency and multivalency both are nouns.

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

As nouns, polyvalency and multivalency are synonyms defined as:

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

Other synonyms of polyvalency include multivalence, polyvalence.

polyvalency (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