It is called "Canadian" whisky, made mostly with rye.

It is pronounce "a rye" (like the grain or whisky)", meaning with a turn or twist to one side; askew Cheers Malcolm

Rye is a grain, like wheat, oats or barley, which developed particularly in eastern Europe. It is used in baking, particularly in making rye breads including pumpernickel. Rye flour is heavier and darker than wheat. Rye is also used to make distilled liquor, which is called rye whiskey. Rye whiskey is sometimes called Canadian Whisky since it is very popular in Canada, and the brand name Canadian Club is known world-wide.

The only difference is the majority of grain in the mash. Bourbon is corn based instead of rye so your Old Overholt Straight Rye Whisky is composed of a minimum of 51% rye and aged for a minimum of 2 years. ----------------------- Rye Whisky is produced at not exceeding 80% alcohol by volume (160 proof) from a fermented mash of not less than 51 percent rye and stored at not more than 62.5% alcohol by volume (125proof) in charred new oak containers. The Straight in its label indicates it was aged for a minimum of two years in the charred new oak container. Bourbon Whisky is produced in the U.S. at not exceeding 80% alcohol by volume (160 proof) from a fermented mash of not less than 51 percent corn and stored at not more than 62.5% alcohol by volume (125 proof) in charred new oak containers. Previous answer was incorrect in that bourbon may be made anywhere in the United States.