whacko vs geek

whacko and geek both are nouns.

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

As nouns, geek is a hypernym of whacko; that is, geek is a word with a broader meaning than whacko:

Other hypernyms of whacko include eccentric, eccentric person, flake, oddball.

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

whacko (verb)	geek (verb)
	to be intoxicated