[RascalPuff]

Webster's (abbreviated):

Killing & Murder

The two words are very commonly used interchangeably;
yet, they do not at all mean the same thing.

Merriam Webster Dictionary:

Kill - To deprive of life.
To put an end to.
Defeat.
Use up
To mark for omission

Thesaurus:

To take a life.

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Murder:

The crime of unlawfully killing a person,
especially with malice aforethought.

Thesaurus:
To take a life criminally or surreptitiously.
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Colloquial vocabulary blurs the meaning of of these two words.
To do this is to subtract from the important difference:
To introduce a 'gray zone' between necessary and unnecessary taking of life. Particularly of human beings.
This ambiguity is a symptom of a greater maladay. What some traditional Native American's often described - and still describe - as 'The White Man's Disease', though, certainly the 'misunderstanding' crosses most cultural borders.