geek vs wacko

geek and wacko both are nouns.

Word	Noun	Adjective	Verb	Adverb
geek	Yes	No	Yes	No
wacko	Yes	No	No	No

As nouns, wacko is a hyponym of geek; that is, wacko is a word with a more specific, narrower meaning than geek:

Other hyponyms of geek include crackpot, crank, fruitcake, nut, nut case, screwball, nutter, whacko.

geek (noun)	wacko (noun)
a person with an unusual or odd personality	a person who is regarded as eccentric or mad
a carnival performer who does disgusting acts

geek (verb)	wacko (verb)
to be intoxicated