Free World vs accumulation

Free World and accumulation both are nouns.

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

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

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

Free World (noun)	accumulation (noun)
anti-communist countries collectively	the act of accumulating
	several things grouped together or considered as a whole
	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition