hook vs crotchet

hook and crotchet both are nouns.

Word	Noun	Adjective	Verb	Adverb
hook	Yes	No	Yes	No
crotchet	Yes	No	No	No

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

Other hyponyms of hook include boat hook, buttonhook, cup hook, fishhook, gaff, gig, meat hook, skyhook, bolus hook.

As nouns, hook and crotchet are synonyms defined as:

hook (noun)	crotchet (noun)
a short swinging punch delivered from the side with the elbow bent	a small tool or hooklike implement
a golf shot that curves to the left for a right-handed golfer	a strange attitude or habit
a basketball shot made over the head with the hand that is farther from the basket	a musical note having the time value of a quarter of a whole note
a curved or bent implement for suspending or pulling something	a sharp curve or crook; a shape resembling a hook
a mechanical device that is curved or bent to suspend or hold or pull something
a catch for locking a door
anything that serves as an enticement
a sharp curve or crook; a shape resembling a hook

hook (verb)	crotchet (verb)
approach with an offer of sexual favors
entice and trap
secure with the foot
to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
fasten with a hook
catch with a hook
hit with a hook
hit a ball and put a spin on it so that it travels to the left
make a piece of needlework by interlocking and looping thread with a hooked needle
make off with belongings of others
take by theft
rip off; ask an unreasonable price