
Tennessee whiskey is an American whiskey made to the bourbon standard and then mellowed through a deep bed of maple charcoal before the barrel. Made only in Tennessee, it comes out rounder and softer for that step.
One extra step in the making is the whole of the difference, and it is a softness rather than a flavor. A swap inside the family costs you that and sharpens the oak; the strength and the sweetness stay where they were.
Bourbon meets the same standard and stops there. This one adds the Lincoln County Process, so at the same age and proof a bourbon Old Fashioned reads sharper and drier.
"Jack Daniel’s is a bourbon"
It isn’t: it’s Tennessee whiskey — the bourbon recipe, but charcoal-filtered by the Lincoln County Process before the barrel. Legally its own category.