cosmopolitan vs oecumenical

cosmopolitan is a noun but oecumenical is not a noun.

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

As adjectives, cosmopolitan and oecumenical are synonyms defined as:

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

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

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