First, I need to tell you to never write "wanna" it's not done by native speakers. "Dying" means "the act of dying". "As he lay dying, he asked for his son." "Dead" means "death has already happened". "After he spoke to his son, he stopped breathing. He was dead."

If it is dying it is still alive. If it is dead it is not alive

"To die" is a verb. "Dead" is an adjective. She is running. She is falling. She is dying. She runs. She falls. She dies. She ran. She fell. She died. She is young. She is smart. She is dead. The man died yesterday, so now he is dead.