Lake of Fire

Dictionary of Biblical Words:

It is among the terms Scripture employs to express the endless punishment or torment of the lost, the lake of fire or second death (in contrast with the resurrection and life) where their worm dieth not, and the fire is not quenched. The Old Testament chiefly dwells on temporal judgment here below; the new, characteristically, though not exclusively, on everlasting punishment in hell or gehenna.

Concise Bible Dictionary:

See HELL.