hook vs fishhook

hook and fishhook both are nouns.

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

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

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

hook (noun)	fishhook (noun)
a short swinging punch delivered from the side with the elbow bent	a sharp barbed hook for catching fish
a golf shot that curves to the left for a right-handed golfer
a basketball shot made over the head with the hand that is farther from the basket
a curved or bent implement for suspending or pulling something
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)	fishhook (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