Final answer:
The word 'hell' came from the Norse mythology and merged with the concept of punishment after death in Christianity.
Step-by-step explanation:
The word 'hell' originated from the name of the land and a goddess who resides over the frozen underworld. In Norse mythology, Hel is the ruler of the realm of the dead. When Christianity spread, the concept of hell as a place of punishment after death merged with the Norse mythology, leading to the association of the word 'hell' with the idea of a fiery underworld.
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