shackle vs constrain

shackle is a noun but constrain is not a noun.

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

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

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

Other hypernyms of shackle include confine, hold, restrain.

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

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

Other hypernyms of shackle include confine, hold, restrain.

shackle (noun)	constrain (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)	constrain (verb)
restrain with fetters	severely restrict in scope or extent
bind the arms of	to close within bounds, or otherwise limit or deprive of free movement
	compel to behave in a certain way