smithereens vs aggregation

smithereens and aggregation both are nouns.

Word	Noun	Adjective	Verb	Adverb
smithereens	Yes	No	No	No
aggregation	Yes	No	No	No

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

Other hypernyms of smithereens include accumulation, assemblage, collection.

smithereens (noun)	aggregation (noun)
a collection of small fragments considered as a whole	the act of gathering something together
	several things grouped together or considered as a whole