crazy vs loony

crazy and loony both are nouns.

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

As nouns, crazy and loony are synonyms defined as:

Other synonyms of crazy include looney, nutcase, weirdo.

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

crazy (adjective)	loony (adjective)
intensely enthusiastic about or preoccupied with	informal or slang terms for mentally irregular
possessed by inordinate excitement
foolish; totally unsound
affected with madness or insanity
bizarre or fantastic