Yes, curry powder can make a good substitute for turmeric given that one of the main ingredients in curry powder is turmeric! Keep in mind that curry powder is a blend of many spices and can vary widely in taste, depending on the brand. Curry powder typically includes spices like coriander, cumin, ginger, pepper--in addition to turmeric. When replacing curry powder for turmeric, use sparingly at first until you can taste the dish and make sure the taste is to your liking.