shepherd's crook vs crook

shepherd's crook and crook both are nouns.

Word	Noun	Adjective	Verb	Adverb
shepherd's crook	Yes	No	No	No
crook	Yes	No	Yes	No

As nouns, shepherd's crook and crook are synonyms defined as:

shepherd's crook (noun)	crook (noun)
a long staff with one end being hook shaped	a long staff with one end being hook shaped
	someone who has committed a crime or has been legally convicted of a crime
	a circular segment of a curve

shepherd's crook (verb)	crook (verb)
	bend or cause to bend