epidemic vs ecdemic

epidemic is a noun but ecdemic is not a noun.

Word	Noun	Adjective	Verb	Adverb
epidemic	Yes	Yes	No	No
ecdemic	No	Yes	No	No

epidemic (noun)	ecdemic (noun)
a widespread outbreak of an infectious disease; many people are infected at the same time

epidemic (adjective)	ecdemic (adjective)
(especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously	of or relating to a disease that originates outside the locality in which it occurs