Monster?

pred·a·tor
noun
1. Zoology . any organism that exists by preying upon other organisms.
2. a predatory person

How do you define a predator?
Is it teeth or claws?

Is it the intent to kill?
paired with the ability to overcome the weak?

Or is it less sinister?
A need simply being fulfilled?

Not the flesh tearing?
Not the final helpless scream?

But something simple
Simply

Maybe

Now tell me what is the definition of a murderer?

Tell me
I dare you.