fauna vs unattached

fauna is a noun but unattached is not a noun.

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

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

fauna (adjective)	unattached (adjective)
	not associated in an exclusive sexual relationship
	not fastened together
	(of animals) able to swim about; not attached