unusual vs crazy

unusual is not a noun while crazy is a noun.

Word	Noun	Adjective	Verb	Adverb
unusual	No	Yes	No	No
crazy	Yes	Yes	No	No

unusual (noun)	crazy (noun)
	someone deranged and possibly dangerous

unusual (adjective)	crazy (adjective)
not usual or common or ordinary	intensely enthusiastic about or preoccupied with
being definitely out of the ordinary and unexpected; slightly odd or even a bit weird	possessed by inordinate excitement
not commonly encountered	foolish; totally unsound
	affected with madness or insanity
	bizarre or fantastic