crazy vs unusual

crazy is a noun but unusual is not a noun.

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

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

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