ecumenical vs ecumenism

ecumenical is not a noun while ecumenism is a noun.

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

ecumenical (noun)	ecumenism (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)

ecumenical (adjective)	ecumenism (adjective)
of worldwide scope or applicability
concerned with promoting unity among churches or religions