Hi Melody, *waving*
You're doing great, gal!
I used to think that coconut oil and butter were the same thing, but apparently there is a type of coconut butter that is very different. In any case, most recipes calling for 'melted coconut butter' actually refer to the oil. Coconut oil is solid at room temp. (hence it being sometimes called 'butter'). It's why a lot of desserts (esp. cakes) call for coconut oil/butter as it helps set the mixture.
Cacao butter is even firmer at room temp., plus it has a very different flavor, of course. However, you can still sub coconut oil for it in most recipes.
Have fun uncooking!