Theologically, how do 'annihilationism' and 'universalism' differ?

Annihilationism states that the wicked are destroyed eventually rather than suffering in hell forever. Those who teach annihilationism do not believe that God would cause the wicked to suffer in hell forever. To them, God would be immoral if He causes the wicked who have rejected Jesus Christ to suffer for eternity in hell.

Universalism is a doctrine that teaches all people will be saved. Other names for this doctrine are universal restoration, universal reconciliation, universal restitution, and universal salvation.