Murder = illegal killing
Manslaughter is illegal killing too and it involves no question of intention to kill.
This difference is usually borne out in (a) moral censure and (b) sentencing, at least in the criminal law. In wartime though it's still accurate to distinguish between the two. Is there a practical difference to the relatives of the dead? Probably not. But if discussing moral culpability or legal culpability in the context of international law, there is one.
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