Actually, some of my favorite spell names used words that I had never heard before, such as "prismatic", "incendiary", "mnemonic", and "phantasmal". Certainly gave my vocabulary a jolt, I can tell you.
Prismatic Spray, Incendiary Cloud and Phantasmal Killer aren't the things I'm talking about. You can infer their functions entirely from their names, and the rules are only needed for specifics. Well, 'prismatic' is a technical termini in D&D, but once you know what one of them does, you know what they all do. I was talking about things like Crescendo Sword or Divine Reverence which tells you nothing about what they actually do.