world organization vs alliance

world organization and alliance both are nouns.

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

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

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

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

world organization (noun)	alliance (noun)
an international alliance involving many different countries	the act of forming an alliance or confederation
	a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
	an organization of people (or countries) involved in a pact or treaty
	a connection based on kinship or marriage or common interest
	the state of being allied or confederated