So, a light year is the amount of distance in a year that light can travel in a vacuum. So the, it clearly has the word “year” in the name. Which is a measure

So, a light year is the amount of distance in a year that light can travel in a vacuum. So the, it clearly has the word “year” in the name. Which is a measure of time. But it’s also a measure of distance, because the speed of light in a vacuum is a constant, and the distance it can travel in a year is also constant. So, why not both?