shackle vs restrain

shackle is a noun but restrain is not a noun.

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

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

shackle: restrain with fetters
restrain: to close within bounds, or otherwise limit or deprive of free movement

Other hypernyms of shackle include confine, constrain, hold.

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

shackle: bind the arms of
restrain: to close within bounds, or otherwise limit or deprive of free movement

Other hypernyms of shackle include confine, constrain, hold.

shackle (noun)	restrain (noun)
a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)
a U-shaped bar; the open end can be passed through chain links and closed with a bar

shackle (verb)	restrain (verb)
restrain with fetters	prevent the action or expression of
bind the arms of	to close within bounds, or otherwise limit or deprive of free movement
	restrict (someone or something) so as to make free movement difficult
	prevent (someone or something) from doing something