looney vs crazy

looney and crazy both are nouns.

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

As nouns, looney and crazy are synonyms defined as:

Other synonyms of looney include loony, nutcase, weirdo.

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

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