ecumenism vs ecumenic

ecumenism is a noun but ecumenic is not a noun.

Word	Noun	Adjective	Verb	Adverb
ecumenism	Yes	No	No	No
ecumenic	No	Yes	No	No

ecumenism (noun)	ecumenic (noun)
(Christianity) the doctrine of the ecumenical movement that promotes cooperation and better understanding among different religious denominations: aimed at universal Christian unity
a movement promoting union between religions (especially between Christian churches)

ecumenism (adjective)	ecumenic (adjective)
	concerned with promoting unity among churches or religions