As we mentioned above, yakitori means chicken that is cooked on a grill. Yakitori sauce refers to the sauce that's put, specifically, on that chicken. Teriyaki sauce ("teri" means luster and "yaki" is grill) can be applied to meats or veggies that are going to be cooked on a grill. Both yakitori sauce and teriyaki sauce have soy sauce, mirin, and rice vinegar as the recipe's base. The sweetening agents are different, though. Brown sugar, which melts into the sauce and creates a caramel color when cooked, is added to yakitori sauce. It's also thinned out by the additional water. Honey is added to teriyaki sauce, making it sweeter and thicker than yakitori sauce.