worldwide vs cosmopolitan

worldwide is not a noun while cosmopolitan is a noun.

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

As adjectives, worldwide and cosmopolitan are synonyms defined as:

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

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

worldwide (adjective)	cosmopolitan (adjective)
of worldwide scope or applicability	growing or occurring in many parts of the world
spanning or extending throughout the entire world	composed of people from or at home in many parts of the world; especially not provincial in attitudes or interests
involving the entire earth; not limited or provincial in scope	of worldwide scope or applicability