As nouns the difference between death and lich
is that death
is the cessation of life and all associated processes; the end of an organism's existence as an entity independent from its environment and its return to an inert, nonliving state while lich
is a corpse or dead body.
As a proper noun Death
is the personification of death, often a skeleton with a scythe, and one of the four horsemen of the apocalypse.