noun

a piece of metal or other hard material curved or bent back at an angle, for catching hold of or hanging things on.

a picture hook

peg,holder,fastener,fastening,catch,clasp,hasp,clip,pin,buckle,hook and eye,fibula

verb

attach or fasten with a hook or hooks.

the truck had a red lamp hooked to its tailgate

attach,fix,hitch,fasten,secure,clasp,hasp,grapple