Literal:
* Hell: This is the most direct opposite in religious contexts, representing a place of suffering and punishment.
* Earth: This is the literal opposite in a physical sense, referring to the planet we live on.
Figurative:
* Hell: This can also be used figuratively to describe a very unpleasant situation.
* Earth: This can be used figuratively to describe something mundane, ordinary, or lacking in spiritual significance.
* Earthly: This signifies the material world, as opposed to the spiritual or heavenly realm.
* Mortal: This emphasizes the limitations and fragility of human life, contrasting with the eternal nature of heaven.
* Despair: This is the opposite of the joy and peace often associated with heaven.
* Misery: This refers to a state of great unhappiness and suffering, the antithesis of heavenly bliss.
Other possibilities:
* Hades: In Greek mythology, the underworld.
* Sheol: In the Hebrew Bible, the place of the dead.
* Inferno: A place of intense suffering, often associated with hell.
The best opposite for "heaven" will depend on the specific context and the meaning you want to convey.