crank vs geek

crank and geek both are nouns.

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

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

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

crank (noun)	geek (noun)
a hand tool consisting of a rotating shaft with parallel handle	a person with an unusual or odd personality
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant	a carnival performer who does disgusting acts
a bad-tempered person
a whimsically eccentric person

crank (adjective)	geek (adjective)
(used of boats) inclined to heel over easily under sail