world organization vs coalition

world organization and coalition both are nouns.

Word	Noun	Adjective	Verb	Adverb
world organization	Yes	No	No	No
coalition	Yes	No	No	No

As nouns, coalition is a hypernym of world organization; that is, coalition is a word with a broader meaning than world organization:

world organization: an international alliance involving many different countries
coalition: an organization of people (or countries) involved in a pact or treaty

Other hypernyms of world organization include alignment, alinement, alliance.

world organization (noun)	coalition (noun)
an international alliance involving many different countries	the union of diverse things into one body or form or group; the growing together of parts
	an organization of people (or countries) involved in a pact or treaty
	the state of being combined into one body