cuff vs shackle

cuff and shackle both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuff	Yes	No	Yes	No
shackle	Yes	No	Yes	No

As nouns, shackle is a hypernym of cuff; that is, shackle is a word with a broader meaning than cuff:

cuff: shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs
shackle: a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)

Other hypernyms of cuff include bond, hamper, trammel.

As verbs, shackle is a hypernym of cuff; that is, shackle is a word with a broader meaning than cuff:

Other hypernyms of cuff include fetter.

cuff (noun)	shackle (noun)
the lap consisting of a turned-back hem encircling the end of the sleeve or leg	a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)
shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs	a U-shaped bar; the open end can be passed through chain links and closed with a bar

cuff (verb)	shackle (verb)
hit with the hand	restrain with fetters
confine or restrain with or as if with manacles or handcuffs	bind the arms of
to get involved in a relationship with another person