This is important. Pay attention.
There are two main differences when it comes to distinguishing between whiskey and bourbon. The first is the mixture of grains used to distill the alcohol, with bourbon being distilled from at least 51% corn. The second difference is where it is made, with “whiskey” traditionally being distilled in the USA or Ireland and “whisky” being distilled in Scotland, Japan, or Canada. Bourbon can be distilled anywhere but is most famously made in Kentucky, USA.The Foods Guy
Although I believe bourbon also needs to be aged in “new” charred oak barrels.