What’s the Difference Between Whiskey and Bourbon?

When you visit your favorite liquor store, a lot of choices for alcoholic beverages will welcome you. They are classified depending on brand, flavor, and type of alcohol. One of the most complex types of alcoholic beverage is whiskey because it comes with different variations depending on the geographic area such as Canadian, Irish, Scottish, American and more.

The three well-known kinds of whiskey are Bourbon, Scotch, and Rye, and the most popular of them is Bourbon.  You can find all these are presentations in all monthly bourbon clubs. Also, Kinnitty Castle Spirits pays homage to Ireland’s uisce beatha and driogadh heritage with a bold approach and a dash of rebellion.

If you’re a whiskey enthusiast, you must’ve heard the line, all bourbon is whiskey but not all whiskey is bourbon. Well, if that is true, what do you think makes bourbon different from whiskey?

Whiskey

Whiskey is a distilled spirit made from fermented grain mash. The grains used often include wheat, rye, barley, and corn. After fermentation and distillation, the spirit is aged in wooden barrels, which give whiskey its color and much of its flavor.

What Is Whiskey Made From?

Whiskey starts with a mash—a mixture of crushed grains and water. The grains can vary, but common choices are:

• Barley

• Rye

• Wheat

• Corn

These grains are fermented to produce alcohol, then distilled to concentrate the alcohol content. The resulting liquid is then aged in barrels, often made of oak, which imparts flavor, color, and character over time.

Aging and Flavor

The aging process plays a major role in the final taste of whiskey. As the spirit sits in wooden barrels, it absorbs flavors from the wood, such as:

• Vanilla

• Caramel

• Spice

• Smoke

The longer it ages, the more complex the flavor tends to become. Most whiskeys age for at least three years, though some premium varieties age for decades.

Whiskey vs. Whisky: Spelling Matters

You might have noticed two different spellings: “whiskey” and “whisky.”

• “Whiskey” (with an e) is used in the United States and Ireland.

• “Whisky” (without the e) is the preferred spelling in Scotland, Canada, and Japan.

Despite the difference in spelling, the drink itself remains the same in its basic form—a distilled spirit made from grain mash and aged in barrels. The spelling usually reflects local traditions rather than changes in ingredients or production.

Bourbon

Bourbon stands apart from other types of whiskey because of how it’s made—and the rules that govern its production. Unlike many spirits, bourbon must follow specific federal regulations to earn its name. Yes, there are actual laws that define what bourbon is and how it must be made.

Let’s explore what makes bourbon unique, where it comes from, and how it became one of America’s most iconic spirits.

What Is Bourbon?

Bourbon is a type of American whiskey. By law, it can only be made in the United States. While people often associate bourbon with Kentucky, and for good reason, it doesn’t have to be made in Kentucky to be called bourbon. However, about 95% of all bourbon is still produced in Kentucky.

The name “bourbon” likely comes from Old Bourbon, an area that was part of Virginia in the late 18th century but is now Bourbon County, Kentucky. Barrels of whiskey were shipped from this area down the Ohio River and stamped “Old Bourbon” to mark their origin. Over time, the name stuck to the whiskey itself.

Legal Requirements for Bourbon

The U.S. government has laid out clear rules for what qualifies as bourbon. These are outlined in the Federal Standards of Identity for Distilled Spirits. A whiskey must meet all the following conditions to be labeled bourbon:

1. Made in the United States
   Bourbon must be produced in the U.S. It’s a legal requirement. Even if another country follows the same recipe and method, the result cannot be called bourbon.

2. Grain Mixture with At Least 51% Corn
   The mash used to make bourbon must contain at least 51% corn. The rest can be a mix of other grains like rye, wheat, or malted barley.

3. Distilled to No More Than 160 Proof
   The spirit must be distilled at no higher than 160 proof (or 80% alcohol by volume).

4. Barreled at No More Than 125 Proof
   Before aging, the bourbon must be placed into barrels at no more than 125 proof (62.5% ABV).

5. Aged in New Charred Oak Barrels
   Unlike other whiskeys that might reuse barrels, bourbon must be aged in new, charred oak barrels. These are typically made from American white oak.

6. No Additives
   Bourbon cannot contain any artificial coloring, flavoring, or other additives. The flavor and color must come only from the grain, the fermentation, and the barrel.

7. Bottled at 80 Proof or Higher
   The final bottled product must have at least 40% alcohol by volume, or 80 proof.

These rules protect the integrity and identity of bourbon, ensuring that what ends up in your glass meets a consistent standard.

The Bottle-in-Bond Act of 1897

By the late 1800s, many whiskey makers were cutting corners. They added harmful chemicals, diluted spirits, or mixed batches from different sources. This made it hard for consumers to know what they were drinking—and sparked a push for stricter regulations.

In response, the Bottle-in-Bond Act was passed in 1897. It was one of the first food and beverage safety laws in the United States.

To qualify as bottled-in-bond, a bourbon must:

• Be made during a single distillation season (spring or fall)

• Be made by one distiller at one distillery

• Be aged in a federally bonded warehouse for at least four years

• Be bottled at 100 proof (50% ABV)

This act gave consumers confidence that what they were buying was pure and properly aged bourbon. It also placed the U.S. government as a guarantor of quality.

The Evolution of Bourbon’s Reputation

In the early 1900s, bourbon was considered a cheap drink. Many people saw it as harsh, bitter, and low-quality. Its reputation suffered, especially during and after Prohibition (1920–1933), when illegal distillation damaged the spirit’s image further.

However, bourbon began to improve in the second half of the 20th century. A major turning point came when Bill Samuels Sr. developed a smoother, more refined bourbon.

He created a new recipe using red winter wheat instead of rye. This resulted in a softer flavor with less spice and bitterness. The result was Maker’s Mark, one of today’s most recognized and respected bourbon brands. The wax-sealed bottles and smooth taste helped change public perception of bourbon.

Bourbon vs. Other Whiskeys

It’s easy to confuse bourbon with other types of whiskey, but they have clear differences:

Bourbon’s sweetness, body, and vanilla flavors often set it apart from the sharper or smokier profiles of other whiskeys.

Conclusion

Whiskey is a rich and diverse spirit with a global legacy. Its variations—from Scotch and Irish whiskey to Canadian and American styles—offer something for every palate. Among them, bourbon stands out not just for its bold flavor, but also for its strict production rules and deep American roots.

Whether you’re enjoying a smooth sip of Maker’s Mark or exploring a local rye or Scotch, understanding the basics of what sets these whiskeys apart helps you appreciate them more. So next time you’re browsing your local liquor store or joining a bourbon club, you’ll know exactly what makes bourbon special—and why all bourbon is whiskey, but not all whiskey is bourbon.