purebred vs fauna

purebred and fauna both are nouns.

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

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

Other hypernyms of purebred include animal, animate being, beast, brute, creature.

purebred (noun)	fauna (noun)
a pedigreed animal of unmixed lineage; used especially of horses	a living organism characterized by voluntary movement
	all the animal life in a particular region or period

purebred (adjective)	fauna (adjective)
bred for many generations from member of a recognized breed or strain