This is a pie. Apples. Cherries. Pumpkin. Sugar. Official Definition: "A baked food having a filling of fruit, meat, pudding, etc., prepared in a pastry-lined pan or dish and often topped with a pastry crust." A pie.
This is a pizza. Tomato sauce. Cheese. Toppings. Official Definition: "A flat, open-faced baked pie of Italian origin, consisting of a thin layer of bread dough topped with spiced tomato sauce and cheese, often garnished with sausage slices, mushrooms, etc." A pizza (not a pie).
This is a wagon. Toy. Used by children. Official Definition: "A four-wheeled child's toy designed to be pulled in the transportation of people or objects." A wagon.
This is a cart. Used by adults to shop. Official Definition: "A small vehicle pushed or pulled by hand." A cart (not a wagon).
This is soda. Short for ice cream soda. Also known as a float. Notice the old fashioned glasses. Official Definition: "A beverage consisting of ice cream and pop." Soda.
This is pop. Carbonated bubbles "pop" in your mouth (hence the name). Official Definition: "An effervescent beverage consisting of water charged with carbon dioxide." Pop (not soda).
Now that you know the proper name for things please change your speech accordingly. Thank you.