zany vs wacky

zany is a noun but wacky is not a noun.

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

As adjectives, zany and wacky are synonyms defined as:

Other synonyms of zany include goofy, silly, whacky.

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

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