napoleoniana vs collection

napoleoniana and collection both are nouns.

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

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

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

Other hypernyms of napoleoniana include accumulation, aggregation, assemblage.

napoleoniana (noun)	collection (noun)
items related to the life of Napoleon (engravings, paintings, books, etc.).	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