wacky vs zany

wacky is not a noun while zany is a noun.

Word	Noun	Adjective	Verb	Adverb
wacky	No	Yes	No	No
zany	Yes	Yes	No	No

As adjectives, wacky and zany are synonyms defined as:

Other synonyms of wacky include goofy, silly, whacky.

wacky (noun)	zany (noun)
	a buffoon in one of the old comedies; imitates others for ludicrous effect
	a man who is a stupid incompetent fool

wacky (adjective)	zany (adjective)
ludicrous, foolish	ludicrous, foolish
informal or slang terms for mentally irregular	like a clown