crested vs fauna

crested is not a noun while fauna is a noun.

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

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

crested (adjective)	fauna (adjective)
(of a knight's helmet) having a decorative plume
(of a bird or animal) having a usually ornamental tuft or process on the head; often used in combination
bearing an heraldic device