fauna vs collection

fauna and collection both are nouns.

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

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

Other hypernyms of fauna include accumulation, aggregation, assemblage.

fauna (noun)	collection (noun)
a living organism characterized by voluntary movement	the act of gathering something together
all the animal life in a particular region or period	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole