Lethal injection is a form of execution that has been used by many countries. However, there are several synonyms for this term that can be used to describe this process more effectively. The first synonym is "capital punishment," which is the act of killing a person as a punishment for a crime. Another synonym is "death penalty," which is the legal process of putting a person to death as a punishment for a crime. Other synonyms include "euthanasia," which is a deliberate ending of a person's life without their consent, and "assisted suicide," which is a self-inflicted death assisted by another person. In conclusion, these synonyms provide a more nuanced view of the process of lethal injections.