Free World vs aggregation

Free World and aggregation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Free World	Yes	No	No	No
aggregation	Yes	No	No	No

As nouns, aggregation is a hypernym of Free World; that is, aggregation is a word with a broader meaning than Free World:

Other hypernyms of Free World include accumulation, assemblage, collection.

Free World (noun)	aggregation (noun)
anti-communist countries collectively	the act of gathering something together
	several things grouped together or considered as a whole