dotty vs crazy

dotty is not a noun while crazy is a noun.

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

As adjectives, dotty and crazy are synonyms defined as:

Other synonyms of dotty include gaga, wild.

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

dotty (adjective)	crazy (adjective)
intensely enthusiastic about or preoccupied with	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