fauna vs half-bred

fauna is a noun but half-bred is not a noun.

Word	Noun	Adjective	Verb	Adverb
fauna	Yes	No	No	No
half-bred	No	Yes	No	No

fauna (noun)	half-bred (noun)
a living organism characterized by voluntary movement
all the animal life in a particular region or period

fauna (adjective)	half-bred (adjective)
	(of animals) having only one purebred parent