oecumenical vs cosmopolitan

oecumenical is not a noun while cosmopolitan is a noun.

Word	Noun	Adjective	Verb	Adverb
oecumenical	No	Yes	No	No
cosmopolitan	Yes	Yes	No	No

As adjectives, oecumenical and cosmopolitan are synonyms defined as:

Other synonyms of oecumenical include ecumenical, general, universal, world-wide, worldwide.

oecumenical (noun)	cosmopolitan (noun)
	a sophisticated person who has travelled in many countries

oecumenical (adjective)	cosmopolitan (adjective)
of worldwide scope or applicability	growing or occurring in many parts of the world
concerned with promoting unity among churches or religions	composed of people from or at home in many parts of the world; especially not provincial in attitudes or interests
	of worldwide scope or applicability