Mercy killing and Physician-assisted suicide

Mercy killing noun - The act of killing someone painlessly (especially someone suffering from an incurable illness).

Physician-assisted suicide and mercy killing are semantically related. In some cases you can use "Physician-assisted suicide" instead a noun phrase "Mercy killing".

Physician-assisted suicide noun - Assisted suicide where the assistant is a physician.

Mercy killing and physician-assisted suicide are semantically related. You can use "Mercy killing" instead a noun phrase "Physician-assisted suicide".