nuclear club vs collection

nuclear club and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear club	Yes	No	No	No
collection	Yes	No	No	No

As nouns, collection is a hypernym of nuclear club; that is, collection is a word with a broader meaning than nuclear club:

Other hypernyms of nuclear club include accumulation, aggregation, assemblage.

nuclear club (noun)	collection (noun)
the nations possessing nuclear weapons	the act of gathering something together
	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole