crook vs flex

crook and flex both are nouns.

Word	Noun	Adjective	Verb	Adverb
crook	Yes	No	Yes	No
flex	Yes	No	Yes	No

As verbs, flex is a hypernym of crook; that is, flex is a word with a broader meaning than crook:

Other hypernyms of crook include bend.

crook (noun)	flex (noun)
a long staff with one end being hook shaped	the act of flexing
someone who has committed a crime or has been legally convicted of a crime
a circular segment of a curve

crook (verb)	flex (verb)
bend or cause to bend	cause (an object) to assume a crooked or angular form
	bend a joint
	form a curve
	contract
	exhibit the strength of