padlock vs shackle

padlock and shackle both are nouns.

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

padlock (noun)	shackle (noun)
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 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

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