fauna vs crested

fauna is a noun but crested is not a noun.

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

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

fauna (adjective)	crested (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