Then death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.
And death and hell were cast into the lake of fire. This is the second death.
Then death and Hades (the state of death or disembodied existence) were thrown into the lake of fire. This is the second death, the lake of fire.
And death and Hades were cast into the lake of fire. This is the second death, even the lake of fire.
Then Death and the Grave were thrown into the fiery lake. This, the fiery lake, is the second death.
And Hell and death were cast into the pool of fire. This is the second death.