synchrony vs synchronic

synchrony is a noun but synchronic is not a noun.

Word	Noun	Adjective	Verb	Adverb
synchrony	Yes	No	No	No
synchronic	No	Yes	No	No

synchrony (noun)	synchronic (noun)
the relation that exists when things occur at the same time

synchrony (adjective)	synchronic (adjective)
	concerned with phenomena (especially language) at a particular period without considering historical antecedents
	occurring or existing at the same time or having the same period or phase
	(of taxa) occurring in the same period of geological time