screwball vs crazy

screwball and crazy both are nouns.

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

As adjectives, screwball and crazy are synonyms defined as:

Other synonyms of screwball include half-baked, softheaded.

screwball (noun)	crazy (noun)
a pitch with reverse spin that curves toward the side of the plate from which it was thrown	someone deranged and possibly dangerous
a whimsically eccentric person

screwball (adjective)	crazy (adjective)
foolish; totally unsound	intensely enthusiastic about or preoccupied with
	possessed by inordinate excitement
	foolish; totally unsound
	affected with madness or insanity
	bizarre or fantastic