napoleoniana vs aggregation

napoleoniana and aggregation both are nouns.

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

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

napoleoniana: items related to the life of Napoleon (engravings, paintings, books, etc.).
aggregation: several things grouped together or considered as a whole

Other hypernyms of napoleoniana include accumulation, assemblage, collection.

napoleoniana (noun)	aggregation (noun)
items related to the life of Napoleon (engravings, paintings, books, etc.).	the act of gathering something together
	several things grouped together or considered as a whole