shackle vs padlock

shackle and padlock both are nouns.

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

shackle (noun)	padlock (noun)
a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)	a detachable lock; has a hinged shackle that can be passed through the staple of a hasp or the links in a chain and then snapped shut
a U-shaped bar; the open end can be passed through chain links and closed with a bar

shackle (verb)	padlock (verb)
restrain with fetters	fasten with a padlock
bind the arms of