Synonyms for Capital punishment:

n.

electric chair, the chair, the death penalty, execute, death row, crucifixion, death warrant, death sentence, behead. act (noun)
executing, death penalty, execution.
capital punishment (noun)
executing, death penalty, execution.
death penalty (noun)
execution, death warrant, death sentence.
killing (noun)
execution.

Other synonyms:

death row, electric chair, behead, the death penalty, crucifixion. Other relevant words:
death warrant, crucifixion, death sentence.