geek vs whacko

geek and whacko both are nouns.

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

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

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

geek (noun)	whacko (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)	whacko (verb)
to be intoxicated