[quote=@Extra]
<Snipped quote by Etcetera>

Is there a difference between killing and murder? What is the difference if there is?
[/quote]

When people say murder, I think it's meant killing someone not out of necessity, but out of a want to kill them. Like, killing an enemy? They're the bad guys, so there's a necessity in that. It's just killing. You don't hate them in particular. But murdering a single person that you just don't like? That's murder.