miscellanea vs aggregation

miscellanea and aggregation both are nouns.

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

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

Other hypernyms of miscellanea include accumulation, assemblage, collection.

miscellanea (noun)	aggregation (noun)
a collection containing a variety of sorts of things	the act of gathering something together
	several things grouped together or considered as a whole