unlocker

As an adjective unlocked

is of a door, etc, not locked (with a key), or that has been unlocked.

As a verb unlocked

is (unlock).

As a noun unlocker is

one who, or that which, unlocks.

As nouns the difference between unlocker and unblocker

is that unlocker is one who, or that which, unlocks while unblocker is one who, or that which, unblocks.

As a verb unlock

is to undo or open a lock or something locked by, for example, turning a key, or selecting a combination.

As a noun unlocker is

one who, or that which, unlocks.