Killing vs Murder

Hi guys. I love to take matters slow and steady. I know its long and I am sorry about it.
This said, lets face today's question. Do you know the difference between KILLING and MURDERING?
They seem to be synonyms, right?
No my friends. They are quite similar with a hell and heaven difference. Relax. Don't stress that busy brain of your's. It already has a lot to deal with.
Now the Answer: Pardon me. I give an example first and the explanation later.
Here it goes: 1) I killed a flying bird. Correct.
                    2) I murdered a flying bird. Incorrect.
That is to say, killing is taking the life of any organism without any motive or purpose. It can be done for fun or just because someone wants to. It does not come with any justification.
On the other hand, murder is ending someone's life due to a reason, a purpose or a motive. It holds a deep thought and is often planned. There is a profound explanation for everything being done.
Hope you understood my point.
Thanks for reading. Stay tuned for more.