defense team vs aggregation

defense team and aggregation both are nouns.

Word	Noun	Adjective	Verb	Adverb
defense team	Yes	No	No	No
aggregation	Yes	No	No	No

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

Other hypernyms of defense team include accumulation, assemblage, collection.

defense team (noun)	aggregation (noun)
the defendant and his legal advisors collectively	the act of gathering something together
	several things grouped together or considered as a whole