First of all, Stand-Your-Ground deals only with the issue of retreat in the context of lawful self-defense. It does not authorize any greater degree of force, nor does it allow you to use force under any lesser degree of threat.
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This is a great question because there is so much confusion around both these terms.
Much of the confusion stems from the fact that although both of these terms have a narrow, technically-correct meaning they have also been commonly used to refer to other aspects of self-defense law beyond these core meanings.
(In addition, of course, Stand-Your-Ground has been deliberately mischaracterized throughout the media by political activists for their own purposes.)