"The elephant eats the oranges."
Translation:Elefanten spiser appelsinerne.
You definitely can. "Æder" and "spiser" are essentially synonymous, but there is a very important distinction in that "spiser" is just "eats/eating", while "æder" is a very crude word. It's eating in a greedy or disgusting manner, e.g. unrestrained consuming of large amounts of food.