unregistered vs creature

unregistered is not a noun while creature is a noun.

Word	Noun	Adjective	Verb	Adverb
unregistered	No	Yes	No	No
creature	Yes	No	No	No

unregistered (noun)	creature (noun)
	a living organism characterized by voluntary movement
	a living being
	a person who is controlled by others and is used to perform unpleasant or dishonest tasks for someone else

unregistered (adjective)	creature (adjective)
not registered
(of animals) not recorded with or certified by an official breed association
(a boat or vessel) not furnished with official documents