lock vs padlock

lock and padlock both are nouns.

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

As nouns, padlock is a hyponym of lock; that is, padlock is a word with a more specific, narrower meaning than lock:

lock: a fastener fitted to a door or drawer to keep it firmly closed
padlock: 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

As verbs, padlock is a hyponym of lock; that is, padlock is a word with a more specific, narrower meaning than lock:

Other hyponyms of lock include bolt.

lock (noun)	padlock (noun)
any wrestling hold in which some part of the opponent's body is twisted or pressured	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 fastener fitted to a door or drawer to keep it firmly closed
a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key
enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it
a mechanism that detonates the charge of a gun
a strand or cluster of hair

lock (verb)	padlock (verb)
become rigid or immoveable	fasten with a padlock
fasten with a lock
keep engaged
place in a place where something cannot be removed or someone cannot escape
become engaged or intermeshed with one another
hold in a locking position
build locks in order to facilitate the navigation of vessels
hold fast (in a certain state)
pass by means through a lock in a waterway