A spell, of itself,is not magic. A spell is trying, by ritual or ceremony, for a magical result.Sometimes successful, many times not!
But magic, itself, is real! It can be demonstrated. Magic is the changing of one or more things into something entirely different.
For instance if you take two things, Willow bark and Meadowsweet, and pound them into a paste. The result is Salacylic Acid. That's Aspirin! It's magic!